I think your point about US power plants is a nitpick – The largest power plants in the world are not located in the US, and either way my point still stands because it's meant to be a rough approximation.

Unlike data centers where electricity consumption is directly correlated with internet usage, Bitcoin's electricity consumption is instead directly correlated with its price (which attracts more miners), and is very indirectly correlated with the number of users or transactions.

It's very possible that Bitcoin could be adopted by a significant (e.g. 10% or more) percentage of the world population even as its price remains fairly consistent, which would mean its total electricity consumption would remain fairly consistent as well.