If an add-on you use requires the IPTV client to be installed, then you have two options
1) Uninstall the add-on that keeps reinstalling IPTV simple client
or
2) Get used to IPTV simple client's behaviour
Beyond that, I can't see another route. You could maybe try deliberately misconfiguring the Simple IPTV client to it fails reasonably quickly, but then you'll likely have error messages to ignore, instead of updates.