For me to put much importance on that data i'd need to see other variables somehow accounted for. Leverages play a big part in someones deadlift style which I reckon could change things, and actual technique must play a part i.e a sloppy lift with no tightness, hips shooting up, back rounding vs a cleaner rep with everything moving in unison. Maybe it wouldn't but we don't really know so, whilst the data is interesting, i'm not sure it's conclusive enough to be useful (yet).
I'm not disagreeing with it just playing devils advocate.
This reminds me of the following quote,
"Not everything that can be counted counts, and not everything that counts can be counted."
Even if we assume the data is correct, does it change things? And if it doesn't, then is it relevant?
In my opinion, you shouldn't really feel any one body part more than the other. It should feel like your whole body has became one object or unit and is moving the weight as such. It should feel and look very "together". I think trying to move or fire different parts in different orders is probably not an ideal road to go down. If hips move more than everything else, or a knee caves in, or the spine position moves more than everything else, or the head position goes crazy, then these are technique flaws and need to be addressed accordingly. I think everyone would agree these are things that need fixed, irrespective of views on the data RE muscle firing sequence.
In the same respect, if you blatantly feel your lower back, there's most likely a problem, and it may or may not be related to muscle firing sequence. When something like this happens, I think it's always best to go back to the drawing board and start with the basics.
How is your technique when you train? How do you break down (if you do) when the weight gets heavy? And what does all this mean and what can you do about it. These questions are way more likely to lead to a solution. I think the research is great for discussion in this case but not so much for action.
I also think people mix up coaching cues with positioning cues. How you describe a certain position and how you verbally cue someone into a position can be drastically different.
"chest up" can make one person move into a neutral spine, and another move into hyper extension, for example.
"Chin down" can take someone into a neutral head and neck position, and others into a flexed position.
And, "hinge/flex at the hips, posterior weight shift with neutral spine, etc" sounds drastically different from "close an invisible door with your a$$", but both describe the same thing.
I believe (and have found) "press the floor away" is a good coaching cue for some people because it can help put them into and maintain more tension in a more efficient starting position. People who have a tendency to get pulled forward with the hips shooting up before the bar has left the floor are an example as it tends to clean their deadlift up like magic. This isn't the only way to fix it, but it's one of many cues that work especially with this type of flaw.
If you lift too much with the back and not enough with the legs/hips, you need cues that help engage more legs/hips, but this doesn't necessarily have any bearing on muscle firing sequence.
I've always deadlifted once per week, with the occasional second variation in like RDL's or rack pulls. However recently I deadlifted 3x per week, but have since decreased to 2x per week, although I still occasionally deadlift 3x/week. Also squat and bench 3x/week now, and just added a 4th press variation. I've jumped on the frequency boat
Also, I pretty much never feel my lower back when deadlifting and rarely have beyond the first 6 months or so that I started doing it, and recently (last 12-ish months), i've been belt free 99% of the time. I occasionally feel the lumbar erectors pumped up/fatigued, but never a "spine" pain. Interestingly this is true even if i've thrown caution to the wind that day. More interestingly i've injured my lower back before and had bouts of pain (although, touch wood, not in years), but it was never due to or directly effected my deadlift.