Gmail Block sends future mail from a sender to Spam; it does not prevent every form of contact. If you may need messages as evidence, preserve them before considering permanent deletion.
Google’s blocking and abuse guidance describes reporting options and advises contacting local authorities if you feel in danger. This page does not establish any change in harassment rates after COVID.
Mailbox controls have limits
Filters can move mail to Trash or Archive, but those messages remain in the mailbox. Permanent deletion removes normal Gmail recovery. Whole-folder clearing may also remove unrelated messages. It is not a substitute for preserving evidence or getting appropriate support.
Read the Gmail blocking guide for the difference between filtering and deletion. BYE!’s inspected automatic cleanup covers Trash, not every folder or every way another person can contact you.