If I did that exercise one day, a couple of days later, and the end of a hack or endurance day, I might do similiar exercises over xc fences, or I might ask different questions - jumping from light to dark or dark to light, jumping narrows or skinnys (great follow up the ring school) or related fences. I could probably get this done with no more than 10 - 12 jumping efforts.
In other words, I've accomplished more with fewer jumping efforts.
I guess the short version of my long winded answer is that if you're thoughtful and have a training plan, you can certainly do two jump schools a week with minimal risk to the horse.
What you can't do is warm up and jump around a stadium course 4 - 5 times one day and then do a full xc school later in the same week.
As always, JMO and JME.
I think a lot of the people reacting negatively have seen WAY too many novices overjumping their horses into boredom or unsoundness by drilling the same things, badly, over and over and over again, and with no training goal in sight, because it's fun for the rider. That does not seem to be the case here.
And it's worth repeating that you should put your random FB critic on your ignore list.