It is for an AIRSOFT gun.
Ugh. Sounds like “fake news.”
Yes, that’s what it is advertised as - which, apparently, is the whole “trick” being played here.
But if you read the article, it points out that the parts in question can be used to convert a REAL Glock to full auto - and mere possession of such a kit, even if you don’t use it to actually convert a Glock, is illegal.
It would probably last about two seconds on a real pistol.