If that wouldn’t work for you, consider removing the app and accessing YouTube via the browser. I would be surprised it there’s not an extension or blocker which can disable those.
1. Open YouTube ReVanced
2. Tap profile picture (top right)
3. Tap Settings
4. Navigate to ReVanced > Layout
5. Tap "Shorts components" at the bottom of the list
6. Enable "Hide Shorts in feed"
[1]: https://www.reddit.com/r/revancedapp/comments/156lw72/the_be...
Every feed reader I tried auto-detects the correct YouTube feed URL if you just give them the channel URL.