Those company-legitimacy boxes are useful for b2b sales when you're trying to sell a product that the companies in question actually pay for. This doesn't seem to be what you're trying to do so IMO I agree with the GP and you're better off removing it.

Look at the ReactJS homepage (https://reactjs.org/), it's the same as yours minus b2b fluff, and heaven knows they could list some companies in there :)

For what it’s worth, as an individual dev, if I can trust the logos, I think it does add social proof. “Trusted by developers at…” can be a way to contextualize it.

Who’s to say that person is right? If anything test it. That person may have a personal and incorrect feeling about the logos. They may be worse at b2b sales than you.

Make sure you are authorized to use their logos. I know Intel would request removal from sites like this when I worked there.

lots of companies put a logo up without permission and just wait for a takedown request, there usually aren’t consequences as long as you comply