Rambam’s Principles of faith

One of the Rambam’s principles of faith is G-d doesn’t have a body (which I obviously believe)

However, I recently learned that the Reivid comments on this and basically says that it can’t be a principle of faith because greater Rabbis have believed that G-d did have a body!

So I have 2 questions:

1) Which Rabbi’s believed such?!!

2) Does that mean the Rambam’s principles are wrong?