Any more+comparitive+than

I heard a person saying, “That place is not any more riskier than this place”. (And it wasn’t about time- like how it has changed from earlier to now) I thought it’s grammatically incorrect to say so.

Anymore can refer to any longer as in “I was doing it but I am not doing it anymore”, or it can be any more with a space like “some more” as in “I have already eaten so much. I do not need any more of it”

But in the context I mentioned earlier it is not about time.

And riskier is already a comparitive and adding more before that makes it incorrect.

This is what I feel but I am looking for an expert answer to know if I am right and if yes, I am looking for a solid explanation as to why it is incorrect.

John Lawler wrote in a comment:

(a) the string not any more riskier than is ungrammatical. It should be either not any more risky than or not any riskier than, but not both. (b) never mind the any more; it's a negative polarity item, but as you point out the problem doesn't have to do with negation particularly.