Currently Crusading Strikes build is being played quite a lot. As you may know that build doesn’t benefit from Windfury Totem at all. Its because the totem only counts melee attacks as auto-attacks. The tooltip states “have a 20% chance when they auto-attack to swing an extra time.” Until the ret rework melee has been the only auto-attack type in the game, however Crusading Strikes is indeed an auto-attack as it automatically attacks the target based on swing timer. So clearly the melee attack not the auto-attack is hardcoded into the Windfury Totem thus making the tooltip indeed incorrect. If it is a bug I am well aware that WF would make quite an impact for CS build but then again it could also be a tooltip error that can be fixed more easily.
Edit. Obv Auto Shot is also a type of auto-attack however the WF tooltip also states that “swing an extra time” which basically excludes shooting.