For anyone still using Boost for Reddit, the latest revanced patch from wchill fixes the missing audio from redgif videos and adds the ability to restore some (not all) deleted content.
https://github.com/wchill/revanced-patches/releases/tag/v5.34.3
Posting here since r/boostforeddit is still set to inactive.
The sub was made inactive (can’t create new posts) and the project was, as far as I know, entirely abandoned in favor of focusing on Boost for Lemmy instead.