VO2 Max is the number one predictor not "strength training".
Also, strength training does not necessarily mean benching 3 plates. Also it does not mean 0 cardio.
wondering why do you think so about VO2 max? This is my focus, and I see slow but linear growth over many years.
When body will start fading, and maintaining will be harder, then developed buffer may start playing more significant role.
Sadly (for me), I think this means I actually have to start doing cardio.