I guess there are two types of "sovereignty" people talk about here.

First is "data sovereignty", which is what the current (data) migrations are all about. As long as the data remains in place where it cannot be suddenly locked away by the US government, people don't care if the CPU was purchased from the US, as the government cannot suddenly disable those (as far as we know at least).

Second is "hardware sovereignty", which is what this article talks about, about the geographical locations where the hardware is designed and built. This is obviously much harder, but also less important at this very moment. That's why you're not seeing people suddenly rushing to fund EU fabs for silicon, there are more important things to focus on right now, with real implications.

The article kind of does everyone a disservice by mixing the two and not clearly separating which ones it's actually talking about. But to be fair, if they did that, then they've wouldn't have been able to publish this whole "Look how they aren't actually sovereign after all" article if they did so, here we are...