New "Feature" activated too early
The block message given to the users of the documents, didn't sound anything like what their lame explanation was later on.
More likely they are putting in place some new "Feature" to block anything they don't like and documents with opinions they don't agree with (Perhaps like criticisms of Google, or unflattering information on their favoured political candidates).
It probably accidentally activated when they were setting it up & started blocking documents based on their new censorship policy which is not yet ready for roll out.
Backup anything you have on Google that you care about to something they can't touch or be prepared to have it taken away at a moment's notice.
Same as all the rest of these "cloud" and "Social" companies, they want to get you hooked talking about great freedoms and lack of cost, but are happy to arbitrarily lock you out of everything with almost no recourse or explanation anytime they feel like it because "terms of service" or "private corporation" type BS. Accountability is apparently only for smaller groups like national governments.