The person tagged the bot in a reply. The post they tagged it in says:
@buildthis.bisks.net build a bluesky bot that periodically tags @buildthis.bisks.net with new website ideas
The thread it's replying to, oldest first (this is the context "this" refers to):
@norvid-studies.bsky.social: not exactly sure what I'm looking at but it seems completely insane
mutual dispatched built