You cannot trust a damn word coming out of Belarus, or almost anywhere in ex-USSR. You can safely assume that death rate in Belarus is 2x-3x of reported.
Well Belarus' government has its issues, for sure. But I notice that the (very real) issues of reporting, only get noticed when they point the "wrong" way (whatever that is for the person speaking). When Japan had fewer cases than South Korea, the widespread explanation was that Japan must have bunk data. Similarly when China's cases dropped.
I don't claim that Belarus, China, or even Japan have perfect data. But they are not North Korea, and if they had widespread devastation their neighbors would be able to tell. I don't think Belarus' data is particularly less trustworthy than Russia's. Both were willing to report cases going steeply up, when it was true.
Really? How do you know what is "wrong" way for me? In any case, Russian excess death is 3x of the official COVID numbers; it is a relatively well known fact, you can google Alexey Raksha, a demograph from the RosStat; he has a great explanation how Russian and the other ex-USSR numbers are made. You actually do not even need to listen to someone else, go and check RossStat numbers by yourself, they almost certainly are in open access.