Are they any lessons about vibrato technique and different styles of vibrato?
I haven't seen any, but I'm just in lesson 14. Tomo did say at the start that you should master chromatic bending in order to learn vibrato.
If you use the SEARCH feature on this site, and you enter "bending" as your search term, you will find several videos that indirectly cover vibrato. Here is Tomo's comment:
"Thanks so much for subscribing to my Guitar Wisdom! Vibrato is a part of good bending technique. Please watch the bending lessons on this site. I am thinking about adding more bending lessons."