WIY: It’s not. The Rambam would call that Apikorsus as well (I think he says that B’feirush somewhere; I have to find where).
Many people have similar views but it doesn’t really sit well with some Gemaros.
I mentioned that Rav Shrira Gaon held it is Muttar to ask a Malach something which is in its control. This is not prayer. When we recite and teach the Ani Maamins we say that we can not pray to Malachim. Even if the Rambam took it further it is possible that we don’t. No one said we hold of everything the Rambam held of, but we do hold of the 13 Ikkarim, especially since he didn’t make them up.