How to stop receiving "iPhone software update" notifications on my mac

Came across this, do not know if this will help your situation but maybe. Receive, pause, or stop notifications on Mac

User wrote " I'm working with several different iPhones with different iOS versions every day." it would seem obvious - let the OS be updated for the iPhone. Apple pushes updates for iPhones for a reason.

Once the offending iPhone(s) iOS is updated - the annoyance notification will cease.

One must a Good Reason not to update the iOS for whatever reason - Developments etc. Then am a a loose to offer any more assistance other than not connect iPhone to computer or run the update bit that is not a solution for your purposes.

Good Luck and maybe a more Senior Contributor will pickup the thread