I have no idea, as I’ve never been to his church in the Sea-Tac area. I’ve never listened to any sermons, so I couldn’t venture a guess that way either. If you would like to know, I’m sure you could write to him and find out.
His church’s website is ...
El Shaddai Ministries
I followed your link to Mark Blitz’s website. I could find no statement as to whether he is pretrib or not. Lots of sermons on his site where one might hear him define his belief on it, but it would be too tedious to listen to them.