One opinion doesn't mean you have the right to get an economics degree, because there are many opinions from that thread, maybe the person you mean is someone who is diligent in reading and listening to news and is good at concluding opinions, which are easy to read and digest by the users of this forum.
Look like even inside information:
Date of this post October 14, 2020, 12:14:08 PM
"Russian currency have big problems
The only Country is left is China who want to Deal with russian currency.
But in Russia Everybody who knows that ruble is highy inflated and all most worthless they all ready use thether cryptocurrency.
The Coming sanctions can only proof that currency is close to de valuation.
As the Russian natural resources was Main reason to buy ruble to buy and export to the west.
If China will not do any Exchange with rubles its sign that currency will be devalued."