Right. I was not very careful with "only if". :)
In any case ICC warrants are not public. Only state parties know the content of the warrants. We don't know what's exactly in them. Only PR is public.
Anyway, it sounded like you're arguing that ICC warrant is something OTP asks for willy nilly on suspicion of a crime. But there is a long prior process where even opening the investigation has to be approved by the chamber or asked for by a state party. Then there's investigation, which in this case was likely quite extensive and helped by third parties, given that just Pillay's UN commission of inquiry alone provided ~7000 pieces of verified evidence and that's just scratching the surface, given that several state parties refered the situation in Palestine to the court, including Palestine itself, court does its own outreach to victims, and I know several projects that periodically sent/d tons of data collected from social media where Israeli state itself publicly posted its massacres of hundreds of civilians per strike early on.
https://www.aljazeera.com/video/newsfeed/2024/6/19/never-see...