iPhone video - which settings for conversion?

@brian , you already answered my question 2 (What are the (negative) consequences editing variable framerate?), back in 2024. In short: If VFR is heavy, there is risk of unpredictable behaviour when editing frame-precise.
Editing Variable Frame Rate Source Clips

Now my question 1 (is my iPhone lying about the actual recorded framerate?) is bothering me even more. In the properties it says “60.000000 fps (variable).” Can i edit that frame-precise with aceptable risk of unpredictable behaviour?
If so, i could skip file conversion completly (which would ease my workflow by far).

Thank you all in advance
Florian