I'm a riding instructor and have been for a few years now, and I have over 40-years riding experience, (and I don't know everything and i'm still learning from people with more experience than me). Blipping confuses the electronics, I can honestly say, that is a new one to me, I think it might be more of a case that blipping confuses that particular instructor, not the electronics. Newer bikes with a slipper clutch, it isn't really required, I find I use it most when shifting the Goldwing, it seems to downshift better that way, and it seems to help the triumph slip in gear easier. Personally I would say, that since you have already paid this guy, take the information and training with a grain of salt, then perhaps find someone with a clue and learn from them. just to straighten out any misinformation you have have been given.
As for that process damaging the bike, I just sold a 1983 Goldwing GL1100 with 550,000km on it, never had a transmission or clutch issue
Currently among other toys I have a 1989 Goldwing 210,000km, hmmmm no clutch or trans issues with that one either, and they have both had a lifetime of blipping