It seems that the "moved online" part is less about FTP and more about the "closed, membership-only" part.
Colloquially, "online" pretty much means "available online", and data that is on systems technically connected to internet but accessible only to a few people isn't considered available online.
I get that. The wording was not misleading or ambiguous.
In my job, I have to deal with network problems of various kinds from time to time, and at the network layer, "online" has a specific meaning (Okay, actually several, depending on context), and that was what my brain came up with first.
Colloquially, "online" pretty much means "available online", and data that is on systems technically connected to internet but accessible only to a few people isn't considered available online.