OK, anonymous guest opened a three and a half year old thread with a blank post. I'll chip in. No one so far has discussed what made the guitar deform in the first place. A 'normal' guitar should not deform in that way. However stick the guitar in front of a strong radiant heat source for an hour or so, or leave it in the boot of a car on a very hot day, and the glue may soften and the tension on the strings will cause the distortion.

It seems to me that if the Thompson method can reverse this deformation, as long as whatever caused the initial distortion is not repeated, the reversal should be stable.