I don’t know anything about the Ermitage except that the Kind of Blue was marked unofficial on Discogs.
But I can say that I have and quite like the 2013 mono reissue on Columbia/Sony. It’s a remix, but they pretty much all are after a certain date. The stereo because the master was damaged, and the mono because it’s missing. Apparently, when this was done, they were making one last transfer of the 3-track master while I was still playable. They did a digital transfer, but also ran analog stereo and mono tapes at the same time and this LP was cut from that mono tape.
Anyway, it looks like it’s still available for a pretty reasonable price and might be easier to track down than older copy, even an affordable one.