Yes. The poster of the content or Nextdoor Support can remove content at any time. Note as well that when a post or thread is removed, all replies to that post or thread are automatically removed as well.

Why are posts removed from Nextdoor?

All neighbors on Nextdoor can report content they believe violates the Community Guidelines. ... In addition, reported content may be reviewed by Nextdoor staff and removed if it violates the Community Guidelines.

How long do posts stay on Nextdoor?

When you change how your newsfeed is sorted, it only lasts for 60 days.