It is true, you can literally check for yourself. And there is no error. I didn't even see it as removed from my side on mbin, like with a mod removal, and thought it wasn't federating as there was neither upvotes, nor downvotes, nor comments, until I checked the modlog on your instance.
I linked 1 album with IIRC 5 images as the thread submission, and a link to a screencap of the modlog, along with some links to the relevant posts and stuff in the body. What exactly was the spam part about this that deserved to be flagged?
There was a persistent spam wave where they followed similar behaviour of posting too many image links. I can't see the exact rule now but I'll try to review later to see why you were caught as a false positive
The post links are badly formatted. Can you try reposting it but make each link be a proper hyperlink on the text? I want to see if it happen again. I think it's because of too many @ signs, whbich was what the spam bot was doing to ping mastodon users
What do you mean by making it a proper hyperlink? I just posted the URL without any special formatting to make the URL itself visible, since they get automatically converted into hyperlinks. At least from my end on mbin. I've learned that Lemmy does not properly format line breaks / paragraphs so maybe that doesn't even work either. But if I'd have to format them as hyperlinks I'd effectively double the @ signs in those URLs too, since I'd add them once as text and once as a link.
Though, I only had one user name with the @ signs in the title, but afaik titles do not ping users. The rest were the @ signs to the various community / instance links.
I can repost it as it was originally since I saved it before removing it myself. Although I also did a quick ninja edit in the title to include "(Album)" at the end, to make it clear that it is more than one image. Not sure if that triggered something too.
Edit: Well, slight error as I linked the original album as the thread instead inside the body. I just got up a couple hours ago... I won't remove it for now for you to look into what's happening though.