Yes, it's up to to Abode to fix, not Apple. As a software developer Adobe gets early looks at all OS updates so they can adjust. It's always been that way.
However, I'm not sure what's afoot in your case. I looked up the system requirements for P. Elements v11 and found this on the Adobe site:

Note that the requirement for Mac OS is "Mac OSX v10.6 though 10.8."
Not knowing if that were written before newer Mac OS versions, I checked the same Adobe specs for P Elements v12, which runs fine on my MacBook Pro with El Capitan 10.11 and found this:

This time it implies that Mac OS 10.9 "Mavericks" is the max for PE 12 but it runs on El Capitan in my shop. Even the specs for the most current version PE 14 say OS 10.10.
So you'll have to ask Adobe because what is on they web site is not realistic. Try both their knowledge base and their user forums first.