The linked Twitter thread includes Harris saying,
> I would def settle for never having to think about it again, but clearly Freddie isn't going to "go away" like he first promised he would, so I'm sorta stuck here with that while he cashes in on self-pity.
And, if you click on the 2018 link, Harris quotes DeBoer writing
> I have abandoned all social media permanently. I have stopped freelance writing. I have in general tried to permanently remove myself from online life and from the world of political writing in which Malcolm resides and I once resided. [...] I have fully committed to constant treatment, and I have fully committed to going away.
So, I mean, yes, Harris absolutely says what commitments deBoer is breaking. That you had to take the extra 60 seconds to follow the links is not a failure on Harris's part. :)
Now, there are all sorts of questions this raises about "how long of 'going away' is enough" and "is expecting permanent exile from public life reasonable." As near as I can tell, though, deBoer decided that the correct answer to "how long is enough" is "about 12 months." It doesn't seem unreasonable to me for Harris to be looking at that a bit askance.