Are the movie seats built for extra wide?

For sure

I am 6'3 and 300 lbs and I'm comfortable in them

Its a dinner theatre so you can have lunch or dinner with your movie. The seat are large.

I think so. If you are overly conscious, go there for lunch/dinner and ask to see the theater. You can then check out the seating.

seats seem large enough and you can move the little tables out to get in easier

Yes