>then everyone else followed suit

NPAPI's death in non-IE-browsers started around 2015. Jobs announcing mobile Safari without Flash was 2010. Unfortunately, ActiveX still works to this very day.

Chrome built up a whole new PPAPI to support reasonably fast Flash support after the Jobs announcement. Microsoft launched a major release of Silverlight long after Jobs' speech, but Silverlight (rightfully) died with Windows Phone, which it was the main UI platform for around its practical death. Had Microsoft managed to launch a decent mobile operating system, we'd probably still be running Silverlight in some fashion today. Even still, Silverlight lasted well until 2021 before Silverlight actually fell out of support.

Jobs may have had a hand in the death of Flash websites, but when it came to Java Applets/Silverlight, the decision had little impact. That plugin model was slowly dying on its own already.