The Russian government has extremely limited avenues to trade Rubles publicly, and exercises dictatorial control over those within its borders who attempt to do so.
The rate is essentially fictional - you theoretical seller, cannot get that rate. [1]
That article is really outdated (from before Russia forced payment in rubles), many capital controls were lifted, foreign exchange is allowed up to a limit. I've seen people still making the claim but much more of the opposite. A lot of people on Bloomberg have contradicted precisely this on air. Most of the evidence in the two month old article is anecdotal and unsourced anyway.
The rate is essentially fictional - you theoretical seller, cannot get that rate. [1]
[1] https://www.reuters.com/business/finance/russias-rouble-rebo...