The /data remove command doesn't remove Gossips entries from villagers.
- Have a villager with Gossips entries
- Run /data remove command on said villager
→ Gossips entries will not be removed, as seen in the video file.
I'm not sure if it matters, but this villager has a lot of Gossips entries, enough to where when you show chat and try scrolling up, the game won't let you scroll up enough to view all the entries.