Can an undead rogue activate Resiliency at exactly 0 HP?

Last week, my unchained rogue got killed; rather than kill me outright, as well as for story purposes, the DM brought me back as undead: I retain my class and skills but apply the "undead" template. As an undead, I now have a Constitution score of 0, which means I would be destroyed when I hit 0 HP (I think?). I also have the rogue talent Resiliency:

Once per day, a rogue with this ability can gain a number of temporary hit points equal to twice her rogue level. Activating this ability is an immediate action that can be performed only when the rogue is brought to below 0 hit points. This ability can be used to prevent the rogue from dying. These temporary hit points last for 1 minute. If the rogue’s hit points drop below 0 due to the loss of these temporary hit points, she falls unconscious and is dying as normal.

Going by the RAW, it sounds like this means I could activate Resiliency if I am taken below 0 HP, but not if I am taken to exactly 0 HP. Is that correct? If not, how would you rule on this?