This is not good from energy mix perspective. The region of Sichuan was using energy from Hydroelectric (renewable). This will mostly move to dirty energy sources.
Coal represents around half of Kazakhstan's energy mix (50% in 2018), followed by oil and natural gas (both with 25% shares).
I don't see any issue here. Coal generated electricity is 100% legal in Kazakhstan. And therefore I don't see a reason why we should worry about it. And in case you are worried about the carbon footprint, then let me remind you that fighting climate change is not our sole responsibility. First let the top polluters such as Saudi Arabia and China reduce the consumption of fossil fuels. After that we can think about using more green energy for Bitcoin mining.
But the most important story here is that the mining rigs were moved from China to Kazakhstan without any issue. This is a very encouraging sign, and hopefully the remaining miners in China would actively consider this possibility.