For the most part dermatology appointments have shown to be useless. He didnt go to a dermatologist to ask their opinion on EC. He went to get a steroid. There is a difference.
Whether he "promised" results or not is irrelevant. You need to actually think for yourself. If someone who isnt even cured promises any results you should always take it with a grain of salt. Especially considering treatment of this condition has shown to be quite specific to each person.
In the end no matter what he said YOU chose to do it. He didnt make you do anything. If you read a post on the internet of someone who isnt even cured and followed it without thought, then thats your fault. All he tried to do is help people. For you to criticize him for that is ridiculous.