They dared to mention Baby Metal, which has like nothing to do with real metal.
Is Turbonegro metal?
Punk.
Is punk metal satire?
What about grunge?
And then there's Kiss ;)
As far as I know they call it deathpunk, and their discography tends to be classified as punk.
My broader point is that there's a lot of metal parody in punk. And a lot of metal is arguably metal parody.
This thread reminds me of the underrated film Airheads, when the band is asked what kind of music they play - the three members all start saying different things ("kinda this, but not really") but end up converging on "power slop".
When did Metallica stop being metal? Was it "Metallica", "Load", or St. Anger? Were they ever metal? Does anyone over the age of 16 care? (the answer is yes).