It's probably lost in translation. From everything I've known about visiting the site (physically, not the website), M9 is the name of the building/facility itself.
There is no M9 telecom that I can find reference to other than the news articles talking about this recent hack event. [I take that back. Using the internet archive I was able to see their site m9com.ru. Looks like they are a home user ISP, but I can't find their AS number so I dont know much else about them, or why them being targeted for an attack would be a big deal other than the "spooky hacker stuff" headline.]. The M9 building houses many network and server spaces owned by lots of different Russian ISPs. I guess M9 Telecom could be one of them.