This question seems to be unanswered for a while, but while reading through the documentation below, I found an interesting spreadsheet with the platform availability of skia and impeller.

Documentation: https://docs.flutter.dev/resources/architectural-overview

Spreadsheet: https://flutter.dev/go/can-i-use-impeller

So the answer is yes, all other platforms use skia, but they are migrating to impeller. Web is the only one that remains skia only.