There are a lot of threads on music technology here if you do a search. And on popular music, or electric guitar.
UMass Lowell has both guitar and music technology. Hartt, Ithaca, Frost, Berklee are possibilities. Columbia College Chicago.
Terms vary and include music technology, studio production, and audio engineering.
But as I wrote in your thread on the other forum, I hope he can major in music if that is what he wants, meaning guitar. That would be a BM. He could also major in music for a BA but that would not usually (there are exceptions) be a performance degree: instead he would do lessons and performance outside of academics.
He sounds more like a kid who would love conservatory or music school, so the trick is to find schools with electric guitar who also have some music tech. He can start out with one and see how he feels along the way, and include both or switch or stay with guitar.