What he actually said, without Vice editing the quote, is:

We can imagine many scenarios, but the most plausible scenario is that she presented herself to him as entirely willing. Assuming she was being coerced by Epstein, he would have had every reason to tell her to conceal that from most of his associates.

From the email thread reproduced in its entirety by Vice at https://www.documentcloud.org/documents/6405929-091320191420....

In my estimation, there's a big difference between Vice's framing of "Stallman said she was 'entirely willing'" and the full quote above. There are, of course, other poor comments in that thread.

EDIT -- I mention Vice specifically, because their article (which I'd read earlier) has similar phrasing to the wording used here (https://www.vice.com/en_us/article/mbm74x/computer-scientist... -- "Stallman said the “most plausible scenario” is that one of Epstein’s underage victims was “entirely willing.”"), and I'd thought the quote that codesushi used was from that publication. On double checking, it might be unfair to single that publication out for the given quote.