He stated that new genetic material cannot enter the gene pool.
Well, that's clearly false. Mutation is one way that new genetic material enters gene pools, and genetic material can move from one gene pool to another as individuals move from one population to another.
He said he majored in Biology in college for a while, and that this is one of the most fundamental concepts of biology.
Suffice to say, it is not. It may be a fundamental principle that he's
pulled out of his ass, but it has nothing to do with the biology that represents consensus science.
Where did he "major in biology", anyway? Bob Jones University?