I found that https://mods.factorio.com/mod/minime also allows to squeak through. Are their approach different?

I'm assuming that mod is making the character hitbox smaller, allowing it to fit between smaller gaps.
This mod actually modifies everything else's collision boxes, that way you can fit between everything, even if the gap is usually extremely tiny.

With miniMAXIme it's impossible to walk between solar panels and miners. But it also doesn't allow biters to squeak through between pipes either

This mod shouldn't allow biters to walk between pipes either, I made the gap perfectly sized for the player to fit but not the biters.