Seems like a made-up term to me, kinda like Friel’s “decoupling”. Why not just call it what it is, rather than pretending to have discovered or invented something new?
In any case, since VO2 is proportional to pace or power, and is the product of SV and O2 extraction, then no, there wouldn’t be a trade-off between “aerobic efficiency” and VO2max. Just the opposite, in fact, i.e., you would expect them to change in parallel. This of course is the basis for the Astrand-Rhyming test for predicting VO2max that used to be commonly offered in YMCAs, etc.