Although I'm a frequent enough reviewer to have failed my share of Review Audits, I'm not seeing how this Answer made it into the test for LQ Posts.
The accompanying "Stop, Look, Listen" text claims:
This post has severe quality issues. It is abusive nonsense, noise, spam, blatantly off-topic or otherwise irredeemable – readers will find it offensive or repulsive rather than helpful.
The Question it responds to asks for a square root of $-i$, and this might be considered somewhat of a Late Answer, with some mild (in my opinion) deficiencies (only one square root is found, the notation uses degrees rather than radians), but it seems not close to how the audit text above characterizes it.
Added: Viewing the Edit History shows that a link to a YouTube video was removed from the post. Without checking the Edit History one might never suspect that the post had been flagged as spam, and indeed it appears the OP himself edited the Answer after the offending link was removed and before the post was deleted.