That sounds fine, it just sounds unrelated to a decision to kill off Edge. You can maintain Edge as a web browser while using Chromium Electron. If you're Microsoft, your decision on whether or not to maintain Edge as a web engine is unlikely to completely pivotally depend upon whether you end up choosing Chromium Electron or Edge Electron. So the tweet doesn't make sense to me.

Off topic but I'll be that guy: I am continually blown away by just how good VSCode is and how it very much overcame two huge obstacles: being an election app, and its poisonous name.

I think its more than just them using it for their apps. I think they want to turn Electron into a reusable Desktop UI framework for Windows and given the fact they now own GitHub they can force that for the Windows rendition of Electron. It all seems like almost a bad idea if it makes Edge too reliant on Chrome. I really was hoping Microsoft would instead have fully open sourced Edge. Edge could use some community love to make it a sweet out of the box Windows browser.