what is nvidia profile inspector and is it safe to use

It's a third party tool that edits the same per-game driver profiles the NVIDIA Control Panel uses, it just shows you a lot more of the settings, including ones the control panel hides. Frame rate limiters, specific AA modes, that kind of thing. Safe in the sense that it isn't malware if you get it from the developer's own GitHub page and not some random download site. It doesn't install anything, it's a single exe. The real risk is changing settings you don't understand and then wondering why a game looks weird. Every profile has a restore to defaults button at the top, so note what you touched. Some antivirus tools flag it just because it pokes at driver settings, that's a false alarm if the source is right.