Something strange is happening with the internal dollar exchange rate on AliExpress. Overall, he is always superior to what
If you follow this link, you can seedetailed data. For example, today the AliExpress exchange rate is 73.64 rubles for $1. This is 26.4% higher than the CBR rate and 28.65% higher than the MOEX (Moscow Exchange) rate.

There is also a Helpix website. The good thing about it is that you can compare the rate on AliExpress with the rate on other Chinese online marketplaces (and, of course, with the Central Bank).
The correctness of the data that websites show is easy to check: you can simply take a product that costs exactly a dollar and see its price in rubles. For example, this one.
Note that sometimes AliExpress can change the course right in the middle of the day several times, but this rarely happens.