Putin is correct
That's because back then they participated in global oil trade, when means selling oil in US dollars. So if the Ruble weakens to the dollar, but you are still selling oil in dollars then yes you are now getting more money for your product in Rubles. That's going to push inflation up as more paper is injected into the Russian economy but hey it lets putin shills believe it's a good thing. If you look at historical data, inflation in Russia jumped from 7% to 15% after the invasion of Crimea, which proves my point above
The problem is it's 2023 not 2014 and Russia no longer sells oil in Dollars. It sells oil in Ruble these days and the weakened Ruble means Russia is getting paid less and less everyday for its oil leading to major budget deficit holes because a large chunk of government spending under Putin has come from oil profits