It is easy now with defederation.
De-federation isn't the tool to solve this specific problem. That community has 34 posts, all by a single user, and under 30 total comments across all threads. I cannot find a single post or comment in that community that would violate any rules on lemmy.ml.
A single user posting content in a community that shares a name with a banned community on another social media platform seems like a very very low bar to push for de-federation.