Well, you'll meet more women that way and learn a partner activity that many women enjoy. If you find that you don't enjoy that activity yourself, learning it will probably be of limited value no matter what. It's not horrible advice; it's just not a "silver bullet". Indeed, there is no "silver bullet".
As it happened I did date a couple guys through that volunteer group, but that was after being in the group for months.
Wolfgang, you're absolutely right that single guys are often advised to take dance lessons to meet women (and the advice usually comes from people who know nothing about the dance world) - still, nothing wrong with that advice per se, it just that the expectations need to be appropriate.
Seems to me that if you take up a hobby, it isn't worth investing the time and money unless you actually enjoy the hobby itself. I bet I could meet lots of men if I took up, say, fly fishing. But you'll never see me getting up at the crack of dawn to put on hip waders; it's just not my thing. There are always singles bars, speed dating and personal ads if the goal is solely romance.