He may be as surprised as I!
If he is allowing you to teach modern pre-mil dispensationalism, contrary to the constitutional standards of the church, it is probably something that needs to be addressed. I'd say the same if you told me he was allowing you to teach 'believer's baptism' instead of 'covenant baptisim'.
While members are not required to subscribe to the constitutional standards, officers are (certain limited exceptions may be taken). If the pastor and session are not properly supervising the teaching, they need to be reminded of their responsibility.
Freepmail me the church name (the only PCA church listed in your city is Korean, and you look more like an Anglo church type), and I'll be happy to raise the issue with him. It would help if you gave specifics as to who and when the teaching occurred.