It was a barely functional prototype. Not a very good one either - since it bankrupted the company trying to market it. It drove around a bit as a semi-functional mockup but after being quietly canned was never seen again.
The only thing that probably prevents Object 640, according to Viacheslav Bulannikov is that he never seen or that there are no footage of the Black Eagle shooting, with that in mind the chances of the Object 640 to be ever in-game is minimal to none. Maybe Object 195 (which is one of mine personal favourite designs) will fall under the same situation however given that T-14 inherited a lot of the Object 195 characteristics specially the autoloader, I have hope that at least this one could be added.
You want a T-80 without proper armor and no autoloading system they can model off of? So basically the bustle is useless because it would either be hand loaded with one loader or a carousel? I wanted it too years ago before I found this out, and the devs even admitted it would be too hard… Now whether or not they pull a Ho-Ri is to be determined. They’ve gone against their own word on quite a bit.