Well, it's true Russia HAS to fulfil TOT obligations , but then again that's just officially, reality is different, as they won't want India to absolve all their tech which will enable India to use it in its own AMCA project, if this was to happen, then India wont be dependent on Russia anymore(meaning loss of billions of dollars for Moscow in this field), hence it will reduce Moscow largest arm importer/cash cow. So of course as any power/country will do, Russia won't give you their best/latest/critical tech which they spent they spent decades of R&D/hard work/experience developing. So India has to be aware of this and take its own measures to mitigate this, I.e by counting only on itself first and foremost instead of always wanting to take the short cut. Investment in R&D and establishing a proper aerospace industry in India should be the way forward, not airing for Moscow to give you their best tech, since you 'paid for it'.lol. That won't happen to be honest.
At best Russia will transfer you part of the tech they think isn't that important/cutting edge/no big deal. India will have to accept this since it has NO OTHER BETTER CHOICE.