I don't mean to disrespect - did you watch the video? He, I think rightfully, implied that Jerry Colangelo spear headed the rule changes to free up guard movement, which in turn would increase scoring/pace. They knew what the future held and adapted to it before everyone else resulting in Nash's best seasons at 30+ age.
I didn't fact check all of that, so maybe he's all wet. Basically, they implemented: strong enforcement of hand and forearm checking above the FT line; eliminated illegal defense; instituted defensive 3 seconds to clear the lane. That all but killed the outsized big man game.
As an example, I wonder how great Shaq would be in today's basketball? Particularly LAL Shaq (Orlando Shaq I think could better run the floor and play at a higher pace). Feels like he wouldn't be HOF/multiple titles great today but, of course, there is the argument that great players play great in any era.