If this is the actual extension by Raymond Hill, it’s pretty trustworthy. They’ve been committed to keeping uBlock Origin open source, won’t sell data, and has stated they’ll never hand the project over, but simply archive the repo and let someone fork.

Ray got stung years ago when they tried to step away from uBlock (the original project, before uBlock Origin) and uBlock ended up getting taken over by the AdblockPlus lot. Ray doesn’t want to go through that again.

They’ve previously archived projects like uMatrix too, an example that they’re not looking to hand over projects to anyone again and leave it to the community to fork and maintain if they want to keep it alive without Ray.

If you’re concerned, fork the repo and maintain your own version so you can be sure it’s trustable.