App not compatible with OCLP?

I installed Nitro (photo editing app) after I went to Ventura some months ago with OCLP, and it worked fine. Since a recent update it now says it doesn't support OCLP, and indeed it now crashes under Sonoma and OCLP 2.4.1. I wondered how an app couldn't work if OCLP was being used. Wouldn't it just interact with the OS?