I don't believe there's any strong evidence of this as yet.
The totality of the engravings on the bullet casings is the evidence.
The only "evidence" that has connected Robinson to the left is a now-deleted Guardian article that has been parroted as evidence long after it was retracted.
Can you walk me through how the engravings lead you to conclude he's a "groyper"? I don't follow.
All four engravings are groyper catchphrases.
Weren’t pretty much all the engravings game related?
Was there like a song in a playlist that had like 50 followers the only link?