Can you link to the source?
I used PowerDeleteSuite which kinda do the same thing but its browser-based
It won’t be for long. See here https://www.theverge.com/2023/7/1/23781408/if-rif-is-still-working-for-you-when-youre-logged-out-heres-why
You can use PowerDeleteSuite to delete all your comments automatically, or replacing that with your own text. In face you can replace them with the title of this post to raise awareness
If you need further instructions, I can help
There are under the hood data that is not displayed on the site which they can scrap. FB would be broke if they only rely on the FB posts alone without all the tracking everywhere. Even your movement on the screen or where you pause on the page are tracked.
So no they dont get all the data unless we federate them.