Agreed. At the end of the day, the same concepts are being taught regardless of acoustic or electric guitar. There are certainly some things that translate better on either instrument for sure, and throughout time you will hear and know what those things are. As far as fundamentals, Christopher's lessons do a great job of helping you explore those concepts; and you can use those on whatever guitar you have available.

One thing I tell my students is that starting on and/or working with an acoustic is kind of like ankle weights. It is always a bonus to work with that as once you switch over to electric, it is always a much easier transition as opposed to the other way around. Best of luck and feel free to ask as many questions as you need.