Omg I’m so scared of heights I can’t even imagine that... they will be walking every Sat! Where did u hear that it would be that strong?
It would be unheard of in an earthquake-safe megastructure like the new stadium that the roof would be so fragile that a 250# man would break one of the ETFE tiles.
Considering the pressure as well as lateral and torsional forces each panel has to endure just on a daily basis let alone during a minor earthquake... the weight of a person would be pretty minor in comparison.
They'd probably want to stick to the metal grid, but I'd be shocked if a person's weight were a concern. It just wouldn't make any engineering sense...at all.
That said, they may insist on special footing because just because it's strong doesn't mean it's scratch resistant and boots with little bits of gravel in them would scratch that roof all to hell and gone.
So I could see them requiring special footwear that is ONLY worn on the roof and is cleaned both before and after a roof walk. That's pretty typical of special materials.
Also, while I love heights, I have wicked bad vertigo. So much so that in some video games or movies (looking at you, Avatar...the scene where he first flies the pterosaur looking thing? oof...), it really kicks in.
When I would raid in World of Warcraft, during one fight we did every week, I'd have to specifically buy ginger ale and saltines because the nausea was almost overwhelming.
So I get you. Just like some people in the old days could walk the "high steel", there are people that can do that today.
Not me. I'd be sliding off the roof...face first...