This is GREAT advice.
I'll also add that most (not all) mature (over eighteen) pitchers can and should almost throw every day, though not at full speed all the time.
It is completely possible and advisable for mature pitchers to work up to a single day of 200 pitches. This may sound like insanity but it works like this:
15 pitches + 8 warmups per inning, times 9 innings.
A pitcher who has good mechanics -- meaning he uses his entire body and uses his legs and leverage to power the ball -- can without harm be in a supervised program that gradually builds to a 175-200 pitch "game day".
Understand that the "pitches" include warmups, drills, long toss, 45-foot throwing, flat ground, pickoff throws, and any other throwing drills / practice.
Yes it sounds crazy today but consider that as recently as the 1970s and early 80s it was not uncommon for an MLB pitcher to complete a game. For example Nolan Ryan and Tom Seaver were often on pitch counts in the 170-190 pitch range (and rarely, if ever, hurt their arms).
IMHO the adult professional pitchers are not pushed at all, and as a result are weaker, have no endurance and are less effective.
ps HS and youngsters should follow the ASMI recommendations for throwing / pitch counts.