Nobody here can answer that, short of reverse-engineering the app or reviewing the app source code if available, and not even really then.
Whether it’s “safe” depends entirely on the app and the app developer.
Both the safety of the app now, and across future app updates.
This app is clearly hooking in oddly and deeply, or is otherwise doing something unusual.
Disabling SIP is not something I’d do for anything short of a critical app from a well-regarded and trusted developer. There’ve been too many problems due to apps that have “burrowed” into macOS over the years, too. Malware, and system add-ons. That’s all part of why SIP exists.