To be fair, the sounds he was imitating weren't very skill-intensive. Heavy distortion and selective bends can take you far. Doesn't make it sound any less impressive, but in terms of relative skill the solo wasn't that great.
In terms of relative skill, anyone here could name 5 people they went to school with who can play that all on guitar, but only one person can do that with their mouth.
I'm ashamed to say that I've always thought those sounds were edited on the movies and were not actually made by him, today I found out I was wrong. Also, that was amazing.