Clipped,
Two things are needed for spin entry, stall and sideslip.
Just to review, 3 1/2 other things can possibly replace the sideslip.
1) When close to the critical AOA, dropping an aileron (say in rapid response to the start of roll-off on one side) effectively increases the AOA in the region of the aileron and could stall that region.
2)When close to the critical AOA, having a some upward gust applied to the outer wing section on one side, causing it to exceed critical AOA.
3)When close to the critical AOA, making a smaller radius turn so that the inside wingtip is flying more slowly that the outer wingtip and effectively causing a greater AOA on the inside wingtip (same vertical vector amount, less horizontal). More an issue with long-winged aircraft.
and 1/2) The typical spin entry we're all aware of, when close to the AOA kicking in rudder for some reason. With the A330 you can substitute differential engine thrust for the rudder. While it may or not slip sideways overall, that's not the problem. It's the yawing so that the inside wingtip flies more slowly or even backwards relative to the other tip. Due to vertical vs horizontal flight vectors of the tips, the inside tip goes critical and the other away from critical.
I'm sure you knew this.