I believe he's referring to the definition of porn that most people don't often think of. "television programs, magazine, books, etc. that are regarded as emph

I believe he's referring to the definition of porn that most people don't often think of. "television programs, magazine, books, etc. that are regarded as emphasizing the sensuous or sensational aspects of a nonsexual subject and stimulating a compulsive interest in their audience." There are plenty of subreddits like r/earthporn that fit this definition. In fact many of the default communities do.