Lol, that was honestly one of the dumbest speeches I've ever heard. Why would you fucking need to hold rouble reserves when you are THE EMITTER of that currency? Central Bank is having troubles stopping rouble appreciation yet this idiot suggests to accelerate this process by converting dollars/euro into it? Say, Russia has only roubles, how is it going to trade? No one is going to trade fully in roubles - those can be used to buy oil, gas & some resources but that's it. What is the relation between budget deficit and investment?
If this dude is a presidential aide, then no wonder Russia pooped its pants during the initial invasion blatantly miscalculating the required firepower, Ukrainian reaction and the sanction levels. They simply don't understand what they are talking about and are feeding false information to the decision-makers, this is treason-level stupidity.