What is the maximum weight that "normal" racing wheels can withstand?
As a sometime wheelbuilder, I'd say yes. Lightweight wheels definitely come with weight limits and you should respect them. It should be in the manual for the wheel, and ideally on the spec sheet as well.

That's not to say you need to obey them, just be aware that when you don't you're much more likely to have problems. But for a race where they matter, it can be worth it. You're likely to get away with them for flat time trial when a steep climb or criterium will see them fail in the first race. But for the TT, those wheels might shave the critical 5s off your time.

It's not just your weight on the saddle that matters. You're also stronger than a lighter rider, and more likely to have a huge amount of explosive power. Those are the things that actually cause wheels to fail because that's when you're side loading the wheel. Throwing the bike around in a sprint is especially bad because you're throwing your weight sideways at the bike on the down stroke.

I've had customers who can't even get a reasonable life out of standard 36 spoke wheels. All it takes is a 100kg guy who races criteriums or rides to work and likes jumping out of the lights, and their wheels start failing after a few Mm. The tricky ones are the 120kg+ riders who are overweight and are riding to lose it. Often we see them only after their first bike has fallen apart under them (and it's a combination of being heavy and poor technique - they don't lift off the saddle on bumps, so the rear wheel takes the full impact of every lip and pothole). Having to explain that no stock wheel will work can be hard - instead of a $500 bike they're going to need a heavy $600 steel MTB with $300 of custom wheels.