> I'm not sure that such content would count, though I'd have to review the wording of the GDPR to be sure. Its intent is to cover information about you that companies/people have collected or derived - which may not include things you have written about other things.
All the actual legal guidance I have seen says it does count, because the content can be cross-references with third parties to identify the author and the fact that they once posted this text on this service. This, if they close their account or delete the specific article the content must be purged.
I'm not sure that such content would count, though I'd have to review the wording of the GDPR to be sure. Its intent is to cover information about you that companies/people have collected or derived - which may not include things you have written about other things.
Even if the GDPRs "right to know what is stored about you" provisions does cover this sort of content, if they have truly deleted the it then they don't have to provide it as they don't have it to provide, and they are not compelled to keep it so that they can provide it on request. I have no idea whether they do truly delete the content in these cases or not, but they might if they've taken it offline due to a generic "inappropriate content" rule: if I deemed something posted to my site inappropriate I would want it properly gone so it couldn't be accidentally made available on my platform again due to some future cock-up on my part. Their ToS and other documentation my offer some clarity on what their policy is here.
As a side note (with somewhat insincere apologies for how snarky I am about to sound): regulations & laws aside, I tend to have little sympathy for people who keep data in an external system with no local (or otherwise independent) backup!