It’s just arse covering
If you look through any bike manual I’ll bet it’ll also say you shouldn’t touch anything on the bike yourself and need a trained chaperon to tighten bolts, Enduro bikes are not intended for drops, suspension has to be serviced every 5 hours….
A similar thread here with some manufacturer (e.g. Crumpton) input on everything being fine.
To quote someone in that thread who conveys my feelings….
If a frame can’t handle a turbo, I don’t want to ride it on the road, simple as that.
I use my carbon bikes extensively on my trainers and never had an issue..
It’s the car drivers, over eager newbies riding in to you and monster pot holes that’ll really crack a frame 😐