I took a time and read it and also read much more.
It is a good example of "he said she said". But Igor Ashmanov considers Rosenberg a good source on Durov brothers and lets say information above is correct.
That means that Durov is used a part of the real estate he had access to to help development of Telegram. It does not mean that Durov is (not) affiliated with Russian government it just means that for Durov it is useful to use Russian real estate he knows and adores and to use Russian talent.
It looks like Telegram servers are somewhere in Europe, BTW.
Telegram has an office in Russia? Do you have sources? I cannot find one to confirm, and as far as I know that's not the case.