Looks like excellent advice to me, no kidding at all. Masturbation is profoundly immature sexuality -- the epitome of childish selfishness. Grown-up men ought to have mastery over themselves and be able to resist that temptation. A healthy marriage makes it much easier to resist, also.
You missed the memo, again! Because chastity is difficult and requires self-denial, we're supposed to ridicule anyone who suggests that we even attempt it.