It is confusing language but basically they're saying "we're giving you this ability, but will be adding a new feature to fix this unfortunate side effect".
I think it will cause a shift to "screenshots of posts" as is done on Twitter/X when the retweeter does not want to @ / mention the original author.
That's perfectly fine. Screenshots as posts deter 90% (my guess) of people from going through the trouble of finding the original post/author, but still allow dedicated people to do that. It reduces the ability to trivially post mindless shit to someone on a whim. I totally believe that this approach can significantly increase the signal/noise ratio, without allowing anyone to silence anyone else arbitrarily.
This feature doesn't change that. Whoever wanted to doctor a screenshot will still do, and whoever wanted to post a real screenshot can still do.
Now, if someone wanted to quote-reply with the legitimacy of a link but now has to make do with a screenshot that their readers may not trust, well, sounds like they haven't earned a good reputation among their readers, and that's entirely their problem.
I think it will cause a shift to "screenshots of posts" as is done on Twitter/X when the retweeter does not want to @ / mention the original author.