I suggest following this topic in the official Adobe feedback forum: Quicktime for Windows to be phased out - no longer supported by Apple | Photoshop Family Customer Community. Adobe product developers actively participate in that forum, whereas this forum is mainly user-to-user and low-level tech support.
...........Have a nice day.
Quick research suggests that Apple themselves has not made an end of support announcement for Quicktime. Instead, third parties are creating this bit of news.
Can someone find a link to an Apple announcement?