Probably what the person above me said, AI moderation, basically detected keywords by AI, if it was archived, it would not be visually visible to anyone besides those who own the asset, so a chance is some AI scanned a bunch of item names and detected “pikachu” as infringing.
If it was a DMCA, you would’ve got a message mentioning it was such, I asked a similar question before involving audio
To simplify, DMCA strikes are direct take-downs from IP holder and are taken seriously, meanwhile moderation sometimes auto-detects copyrighted content and deletes it on it’s own without giving a strike and instead a warning or a community guidelines message
are you sure it was really archived? or could it have been simply off-sale?
The post about the archive system mentions this
“but your decision to archive the item will be considered when applying any account penalties related to the IP report.”