I'm not opposed to even removing the comment outright.
That being said, GitHub does not even offer a time sorted search. Meaning that most of the results are going to be quite old and useless.
Second, API keys being shared on GitHub is quite an old problem. People setup automated scans for this sort of stuff. Me removing my comment isn't going to help anyone who already posted their API key online.
I tried several dozen keys and they're all invalid, so I'm inclined to agree with you for this particular case. Thank you anyway for considering.