Flash's whole raison d'être was as a patch for W3C gridlock. The final emergence of HTML5, ES6, and just simple ideas like video tags did a lot more to kill flash than anything Apple did. Apple not supporting proprietary browser plugins on early iphones (which it still doesn't) probably helped to move us forward to open web technologies a bit faster, and meant the whole internet was less beholden to a single company. One shouldn't forget how many otherwise simple websites at the time were unusable on platforms that Adobe didn't support, or supported poorly. The several x-platform mobile frameworks that we can choose from are almost all based on a rich and open ecosystem of modern javascript and web technologies that Flash was the alternative to.
The electron article you linked to strikes me as speculative hyperbole. All the "threatened" electron apps mentioned in the article are still around, eating up RAM. I updated two of them through the App Store this morning.