It's not just some countries, there are miners spread practically all over the world, if you mean that only in some countries there is a significant percentage of miners, I would agree.

And I would qualify the second part of what you say as well. The migration of miners from China mainly to the US was not because in the US electricity was cheaper than in China, it was because of a political issue. Since then, the price of energy there has been rising in the US. I suppose some will be considering going elsewhere if it continues to rise, but there are many factors to take into account:

1) Moving mining has a monetary and time cost, as well as an effect on the market. When the miners left China many had to sell Bitcoins they had been holding and there was a downturn in the market.
2) They cannot move to a place where the energy is cheaper but there is legal insecurity that makes it possible for the government of the day to prohibit mining in a few months, in addition to confiscating equipment and other measures.
3) The remaining countries with relatively cheap energy are either because they have a lot of nuclear power plants or because they do not comply with the CO2 emission agreements, and there are fewer and fewer of these available, especially if we take into account that they have to meet other requirements, such as legal certainty, etc.

I say this because with your sentence it seems that it is an easy thing, that if energy becomes expensive they leave and that's it, and first it is not so easy, and second it also has a cost, for themselves and for the market.