I didn't hear anything about Hamlin having a pulse? I'm withholding judgement on his situation for the time being, although I agree there is some fishiness especially with the Feds now being involved (per Gateway Pundit).

For Savion Smith though, there's little-to-no evidence that it wasn't anything except a spinal injury:

https://www.freep.com/story/sports/nfl/lions/2022/10/26/detroit-lions-saivion-smith-details-scary-20-seconds-of-temporary-paralysis/69593757007/

And that's not coming from NFL talking heads. Occam's Razor supports it as spinal trauma too (not the case for Hamlin given the particulars of the hit).