No? The system provided you with an icon. You aren’t obligated to redesign anything.
It’s fair to disagree with the aesthetics of the new style or usability of losing unique silhouettes or readability of shrinking icons down to fit in the squircle, but it isn’t creating any obligation for indie developers.
Tell that to the users, who will absolutely bitch and moan and berate. Have you ever done user support?
Although I personally despise iOS squircles on Mac, my newer Mac apps do have squircle icons, not because I want them but rather because users want them. They hate when app icons are "out of place" compared to all of the others on their system.
I think the automatically generated icons for your apps look completely fine. And basically all of the examples you showed. You could remove the border on Bonjeff or add a background color to Underpass (or any of them) if you really wanted. If I had StopThe* side by side in my Dock, I would probably wish the octagons were the same size, but they might not have been to begin with?
(My favorite icons might be in Books.app → Book Store → Sections.)
This kind of crap is an example of the worst of their hubristic tendencies.