I don't have experience directly with Anthropic, but I wouldn't assume anything with such high confidence without knowing the persons situation. No, an individual off the street or with an LLC and 5 employees isn't going to get a special deal from someone like Anthropic.
But if their employer is bringing millions of dollars of potential spend to the table, can tell you from years of experience that turns a lot of 'no's' to 'yes'.
The three letter agencies have and will continue make sure all of those "yes's" become "no's" again, which is why the person you're trying to claim is wrong is right and you are wrong.
You do not have ZDR with fable/mythos, nor will you ever have it again. The bedrock customers who thought they had ZDR learned rather rudely that this was not the case after the government decision that also banned non US citizens from using these models.
I use Notion Enterprise specifically for its Zero Data Retention (ZDR) access. Fable does not offer ZDR, so Notion provides a dedicated settings toggle that disables Fable outright.
I work for a large enterprise and fable/mythos are specifically banned because of the difference in data retention agreements from those models to other Anthropic models.
But if their employer is bringing millions of dollars of potential spend to the table, can tell you from years of experience that turns a lot of 'no's' to 'yes'.