Don't want to rehash our whole discussion from a few days ago, but from my perspective, it definitely looks like you're seeing what you want to see here, unless you're making choices in-game that actively weaker their relationship. In my playthrough where I intentionally spend time with both Josy and Maya and support their relationship, the signs pretty overwhelming point to their relationship moving in a positive direction even though they still have issues to work out.
Now, I could be influenced by my own biases as well of course, but it sounds like a lot of others here feel the same way regarding the MJ throuple's health if you commit to them and don't heavily favor one over the other.