To me it is stupid. Who cares? Been there done that a long time ago and I am not even close to 70. They are just risking injury for no reason other than everyone cares about bench from Joe Weider marketing to sell benches.
I suspect it is an easy regression of ng/dl of total testosterone vs bench 1rpm.
Been there done that. No reason to destroy my shoulders to impress the internet young guys.
What maters as an old guy is hamstrings, low back, core, quads.
The entire concept of upper body strength is just a holder over of Joe Weider bench marketing.