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This really isn’t true. Specific subreddits do, because their mods want to buddy up to the admins. With OP’s search settings, I do get one of the posts they got (only one though), and most of the results are drowned out by posts about some guy called Lemmy. But sorting by New, there’s plenty of results even from today and the past week. Subreddits announcing their fallback instance, a canadian subreddit discovering lemmy.ca, people asking questions about Lemmy. Lemmy-specific subreddits also show up without a problem. And everything I saw, except for that one post from OP’s image, was positive about it.
I think people who have fully left Reddit are falling for confirmation bias when they hear that a post got removed for mentioning Lemmy. While plenty are still up despite doing the same. It’s either because of the other contents of the post, or because of the subreddit it was posted in. If it was about promoting Lemmy alone, all posts that promote Lemmy would be gone, which isn’t the case.
I can only see one of those two posts (the second one) and it’s pretty well reasoned (I don’t agree though, just saying they did provide their reasoning in more than enough words imo). If you’re interested, here’s the link.
To summarize it: