Fun fact, it seems this ban is IP based. (they're still testing in waves with a subset of overall users)
I switched to a new IP with my VPN, and while still signed in to the same YouTube account on the same video without ever clearing my cache or cookies, the block disappeared.
It was early yesterday, before filters had been updated, 30 seconds after a full purge and re-selecting of all relevant filter lists, done within the span of 2 minutes, so I doubt it was those.