Hi Peter,
I don't know the answer to your question nor have any way to test it (I don't use an 80D), but...
Actually, in my opinion Live View with a Touch Screen and Touch Focus may be one of the few occasions when it doesn't make a lot of sense to use BBF...
However, I understand that on 80D when BBF is set up (i.e., AF has been disabled at the shutter release button), Live View's Touch Focus won't work. In Live View, I would think that more useful than BBF and would want to use it.
What you might want to try is set up a C (Custom) mode where BBF is disabled (i.e., the camera is returned to the factory default focus mode) and Touch Focus is enabled (maybe Face Detection, too, if wanted). It would be quick and easy then, to switch over using only the mode dial, when ever you're using Live View.
I've used BBF as my default on many other Canon DSLRs for the last 15 or 16 years. Along with AI Servo, BBF is a very important "must have" feature for me since I shoot a LOT of sports/action. However, I haven't used any of the Canon models with Dual Pixel AF, Touch Screen/Touch Focus control and Face Detection, such as the 80D offers. In cameras with that feature set, even if it did work I probably would disable BBF in Live View and switch to Touch Focus instead, as described above. To me that just makes more sense when using Live View. Even without those features, sometimes I DO disable BBF while using Live View (which really isn't all that often... mostly just macro and close-ups... and maybe the occasional posed portrait or landscape/architecture shot).
BTW, I don't know if it's possible on the 80D, but on the Canon M5 mirrorless with it's similar sensor and DPAF, while using the viewfinder (instead of Live View) you can actually use the Touch Screen for AF point selection with your thumb, in place of the "joystick" or multi-direction buttons that are used for that purpose on the DSLRs.
Unfortunately, I don't see where that video helps answer Peter's question. The video simply shows how to set up BBF on 80D, which Peter obviously already knows how to do and, in fact, has done.