Earlier quoted context omitted.
Am I correct in my understanding that this does still use Electron? (And if so, what is it used for?)
It does not use electron, it is total native and does not use web engines, but it can be used in electron as a Node.js mudule.
In particular, does Yue spawn the Chromium processes and Blink?
If I understand correctly, one can build JS interfaces in Yue without it, though (either with Node.js or with its Yue-specific fork, Yode). It uses Chromium base, but not Blink, right?