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I guess TTO is the same as throttle steering, only to a larger degree.
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I am sure there are lots of technically "correct" definitions but, the way I understand and explain it is... generally:
[start diatribe]
Trailing throttle oversteer is exactly that ... getting OFF the gas, causing the weight shift forward (or towards neutral) most likely while entering a turn or a series of esses and inducing an oversteer situation where you may end up needing "opposit lock" AND gas to correct the problem. Usually, TTO is taught (in Skip Barber and Bondurant) as something to avoid b/c it upsets the cars balance. Don't confuse TTO and TB (trail braking). You can be trail braking into a corner while also sort of creating a TTO condition IF you are braking at the same time you are turning. Similar dynamics affecting the car ... weight shift away from rear onto nose (R or L if turning). IMO low / med / and high HP cars use the same technique to get a car to rotate entering / in the middle / exiting a corner/ I think it depends on what your goal is. Are you trying to maximize speed from turn-in to apex, through the apex, or from apex to turn-out. Do you have more grip than HP ? (Kurt's suggestion) If so, you'll stand on the gas earlier and longer than a lower grip, potentially heavier car with more HP. you can't afford not to. If you have more HP than grip ... and you need to rotate the car b/c of the line you chose on turn-in (screwed it up - or car is set up for all the OTHER corners on the track) then throttle steer until you are pointed in the right direction for the rest of the track. Lifting (inducing TTO) to correct this situation is only more time OFF of the gas ...= slower laps.
I explain (use / demonstrate) and understand "throttle steering" to be rotating the car while UNDER power (accelerating or maintenance throttle for that moment). E.g. I would throttle steer in the middle of a long sweeper, or exiting a corner to track out to get the right amount of rear biased 911 / 912 / 356 slide to reach track out. I would also throttle steer if I got into a corner and the car was understeering (nose pushing out away from the apex). Could happen (and does) from changing track conditions, fluids on track, changing tire grip, late passing =late apexing, etc... Usually, I explain throttle steering as what you "can do" with additional HP (more gas) to rotate the car to point it where you want when you want.
There are probably another hundred variables when you are TTO-ing, TB-ing and TS-ing depending on your fuel load (weight over nose of car changing understeer to oversteer), types / sizes of tires, air pressures, where you are in which gear's power band and how much more punch / rpm do you have to get through that particular corner (run out of revs...?)
[end diatribe]
This stuff will keep us all as "students" trying to learn racecraft. I love it.
FWIW
Jase