From the NFLPA who believes you should not practice tackling?
That is like making spell checking "manditory" on TSW.
More like they don't believe you should practice, full stop.
The reps/practice thing, needs to have a better balance, imho.
There simply must be ways, in this day and age, to practice techniques, especially tackling, without going full blown at it, and it makes too much sense for there not to be more time allowed to do so.
Part of the problem is the long standing tradition the NFL has, of turning a blind eye to stuff that contravenes the CBA, when it comes to practicing.
If they actually made teams pay, and pay in ways it hurts them, e.g. picks etc. then you can have more 'walk through' type practices, or technique practices, as teams who don't toe the line would be punished.
As that hasn't happened in the past, then the NFLPA, is pretty much not going to agree to it, unless there's some sort of nailed down regulation of it, with specific consequences.
Back on the OP, these helmets sound like a great improvement. Seems like the softer shell reduces the initial impact, and the 'crumple' part, acts as an additional 'brake', reducing how quickly the goo inside your head, moves towards the skull. If I was a player, I'd be wanting these, badly, to the extent that I'd possibly even be prepared to pay for one myself.