This is great! Very talented player, and a remarkably good recording given the era and situation.
I once happened upon a huge, deserted music hall attic in which multiple concert marimba of various sizes and other orchestral instruments were stored. Played my heart out on the most gigantic one for about 5 minutes. It was so deep and resonant it shook my entire body and seemingly the entire room. I pulled myself away and split before anyone wandered up to see what was going on. I'm certainly no marimba player though, and I didn't record it, but I sure wish I did!