They’re still going the almost certainly end up running this on US designed chips, with US designed networking equipment and a bunch of other assets tied back to US companies. They should do what they want, but it’s “sovereignty theater” at best.
It's unrealistic for any nation to do everything themselves, but they can make some changes in response to the US starting trade wars, ditching foreign policy/climate objectives, etc...
Sovereignty is not about building everything yourself. Division of labor advances civilization, but it doesn’t have to come at the cost of sovereignty. Sovereignty is about designing the work contract such that you don’t become entirely beholden to another party. You build hardware for me, but after that it’s mine, not yours. I trust you to build the hardware to fulfill that contract, and if you ever break that trust I’ll find someone else to build that hardware. That’s sovereignty. I don’t have to build everything myself.
Even more, Sarcozy was jailed later by corruption, a symptom of a healthy democracy that US should try sometime (It would fix a lot of the current and future US problems).
Jumping in the Trump circus in Europe one year ago, maybe could work; now it equals to political suicide after Greenland, the Middle East mess and the more and more obvious symptoms of Trump's dementia and disgusting behaviour. Definitely didn't worked for Elon in the past Germany elections. European politicians are very aware of this, currently.
The elections in Hungary are probably ultra-rigged at this point, but we will see if Vance performing as guest comedian for the pro-Russian party Fidesz will help Orban (or Vance) in the long term.