The flag seems to be “on fire” for the first second or so before going out, I’m pretty sure that the guy was trying to relight it (the inflammability of the material was already demonstrated, hence the cut).
So in other words, yes it burns, but not very well
Protip: make sure to delete the “si=[gibberish]” part of shared YouTube links, it’s a tracking ID (Share ID) to track the performance of said share link.
i just realised this reads like a copypasta, huh