Anarchism has an ideology whether you choose to admit it or not. Anarchists follow trendy beliefs. Also anarchist does not necessarily mean "anti-government" as there have been anarchist governments. Anarchism also has many different varieties so when people refer to anarcho-capitalism they typically refer to a very distinct variety of anarchism which has a distinct set of beliefs, schools of thoughts, and yes dogma. Just as crypto-anarchism also has dogma such as "code is law" there is dogma in anarcho-capitalism such as "taxation is theft", but then other left anarchists could have a different dogma "property is theft" and have a need to have some kind of commune style of resource distribution.

The point being that it in my opinion was and continues to be a bad idea to put labels on people who didn't choose them. It's better to let people define themselves as individuals without the need for ideology, labels, or camps. If Robert Kiyosaki claims to be a capitalist and wishes to be defined in that way then who are we to disagree with him?