This is quite true, but there are cautions. Be sure the O-ring is not cracked, and it is best not to place the stove in your cookpot.

I once had arranged a climbing date with a gorgeous lady. We were going on a two day excursion on a local technical peak with some friends. We made camp that evening after the approach hike, and made dinner in my cook kit. It tasted a bit odd, but it was all the food we had. In the morning my lady friend felt a bit under the weather, and remained in base camp,unable to witnes my stunning performance on the final crux pitch...

Oh, what might have been! All because of a cracked Trangia O-ring.....

Now, if you do keep the stove out of your pots and pans, leaking alcohol is not nearly as nasty as other liquid fuels. I would still keep it away from climbing ropes, harnesses, and slings.