You won't get "big strong pecs" if all you do is The Giant. There's no squat involved, so you may want to mix those in one way or other (could do as warm-up, light on off-days, or mix in a block of Giant just using squats every 2-4 blocks; I did that trying to deal with elbow problems). Other than that, it checks every box if you stick with it long enough, vary between the 5-templates, vary between the lower and upper limit (for you; 5-7....3.0 would be really tough with a 4rm.... and 8-12) of starting weights, vary between strict and push presses, and you push hard on every session. As your press gets stronger relative to your clean (or you just skip to pp's), it can turn into a series of HIIT sessions. When you're at the limit of your presses, your rest periods will be a lot longer. I'd say that when you're working with relatively heavy weights and long (3-5 minutes) rests, maybe good to do "cardio" on off-days (I was riding a stationary bike for ~40m 2x per week; finished 1.0 2-weeks ago; which was arguably too heavy when I started, but press strength came back quickly as I hadn't pressed in a couple years).
If "maintain VO2 max" is really a concern, and your grip is strong enough to handle it, you could do the whole program with push presses. If 1.2 using push presses doesn't blow your lungs apart, I don't know what would.