Garmin "Low Aerobic Shortage" - outdated advice?

Yeah, I have issues with using HR too. I’m in my 50s and I take daily medications that seem to keep my HR 25-30 beats below max unless I am absolutely drilling it. Some days I sleep well, some I don’t. Some days I have 3 espressos before I ride and some days 1. All those things make hr higher or lower, regardless of whether I did a PZ2 ride or PZ6. I have the same issue where Garmin tends to complain that I have a lack of “High Aerobic” rides and the needle barely moves even if I just did a long Threshold ride. I’d much prefer using power zones. Just trying to help explain how the Garmin training advice works.