That tweet is interesting because it specifically mentions CMI (but as MI3 rather than CMI which may be a tell, but also not saying anything about EMI or Tales), so the canon may still "break". But also it's a series whose canon is kind of loose anyway, so the tweet doesn't entirely answer the question of how it is keeping MI3 in "canon" given his statements years ago that he didn't think it possible. (But he's had two years of development on this project, so it sounds like there was time to solve it, while getting paid to solve it.)
But very interesting Ron is claiming it is not a hard-fork (anymore), at least.
But very interesting Ron is claiming it is not a hard-fork (anymore), at least.