chains dont usually magically fly off. Its a combination of the line a cyclist takes, the tension they have on the drivetrain and their shifting souplesse.
its just my opinion that this chain drop like 80% of them is rider error.
I'm not gonna get into a big debate, but i know from personal experience when the chain drops its not by magic
I think it's fine to get into it. Just because he still won doesn't mean this incident shouldn't get some scrutiny.
So a 1x should have deep teeth on the front chainring, making it hard to drop the chain and making a guide unnecessary. However the derailure should also have a clutch system to keep the chain tight. Something designed for gravel and MTB should stay on pretty good.
So we have to wonder, did they use a standard derailure for better efficiency but poorer chain management? Did they use the right front chainring? Or is just not a good product?
While riding into a pothole is unadvisable a good Gravel 1x setup should laugh that off surely