I feel like some people might read this statement as trying to force a decision between Bitmain's altcoin and BIP148 [...]
No. I read it as a statement to get more approval for Segwit2x. It is "strange" that nobody of the hardliners of both fractions of the blocksize war has mentioned this solution here in this thread, because in the statement they clearly mention it as their goal.
It's simply a counter-offensive to BIP148. I don't support neither of both measures and don't think any of them will succeed. Segwit2x, Luke's Segwit + 2MB pan and also the newer Coop proposal seem reasonable - far from perfect, but acceptable - compromise proposals. So we have the choice.