Look up the quote to get a better sense of what he meant by that

Cann you tell me in your words?

Film is an old medium for art

How would you know?

there are new technologies for art

Which are? You talking about AI?

it's difficult to penetrarte the mind of any artist

Do you talk to me as an artist (like a story teller)? Or do you talk to me from a non artist perspective?

I distinguish between to penetrate the mind of an artist and his work. I may never be able to talk to the artist myself, only to see his art. Being it the former, and I would be interested, I would ask him what was on his mind when he produced his art. Being it the later, I may talk about his art, or not.

but working with them challenged my own assumptions about the meaning of art in general.

What were your assumptions? "Art in general", what do you mean by that?

Art is produced in many ways and through many mediums. There is always art which is considered to be classic and always art which is being seen as new. There is no one superior or inferior, how I see it.

Art is not just creating something expressive but added to that to be able to understand the rules of composition, perspective, proportion, as well as skillful use of the tools.