Thanks for sharing this. I keep going back and forth on upgrading my 2014 MBP. Based on what I read, it seemed like the T2 audio issues were resolved for RME interfaces specifically (as of mid-2019 I think).The T2 chip cannot be "disabled" in any way. You can reduce the security restrictions but it has no effect on the issue he's talking about for two reasons. (I've been dealing with this issue for a year now.)
The amount of errors and glitches you were getting in that video is crazy! Out of curiosity, what audio interface were you using when experiencing these issues? Also have you tried latest Mojave and/or Catalina? Apparently 10.14.4 and 10.14.5 updates "fixed" this for most people according to some threads on Gearslutz.
I may just go for the 2.3 i9 / 64GB / 1TB config which I think will be more than sufficient for travel/dev work, and then try to test it thoroughly while within the return period.