I don't think anyone argues that Python has more than one (static) type. It however has a dynamic type system. Significantly, static types and dynamic types do not behave the same way and their corresponding theories have somewhat minor overlap.

In particular, many things I can state about static types do not carry over to dynamic types and visa versa.

I believe many conversations get derailed early because among static type researchers, static types are known merely as "types" and dynamic types as "tags" or "classes". There are meaningful ways to compare these two kinds of things but somehow or another they ought to have different words since confusing the concepts will inhibit understanding quite severely.