Doh. Yes, you're right:

Stoneclaw Totem's pulses will no longer break stealth on nearby hostile units.
Thanks for the heads-up. So much for first-hand information.

I'll re-test tonight to confirm for myself exactly what drags who out of stealth and whether I can sap a GW. I used it in AV yesterday to get away from an irritating rogue who was just using it as a delaying tactic, but may have just been lucky.