I'm not sure what the question "Is Microsoft still interested in its own Mobile?" means.
If you're asking about hardware, then the answer is no. Not being overly interested in selling hardware doesn't mean MS won't ever produce a new device running W10M however. Maybe they will. Maybe they won't. If they do it might not look anything like a phone though. Wait and see I guess..
If you're asking about software, then the answer is yes. That is simply down to the fact that W10M has a lot in common with W10. W10M may not perform as well as WP8, nor is it as stable, but the cost of developing it is considerably lower. Although that's irrelevant to consumers, it's very relevant to MS, particularly in their current situation. This is why I'm doubtful that the heated board room arguments are as common as some of us may think. I suspect development costs for W10M are now in the low hundreds of millions annually, which is nothing for a mainstream OS. Depending on how much the books are fudged (there is always fudge), even a lot of that may remain invisible to the bean counters.
If you're asking about the platform, the UWP, then the answer is most definitely yes. No matter what happens, the UWP will live on. Even if MS decides to kill W10M and starts using Android as their mobile OS, they will at the very least find a way for their MS branded Android devices to run UWP apps.
All of those things are part of mobile equation, and the answer is different for each part.