part of Thought Bottle
Experience: A thought bottle can be used to offset level loss as a restoration spell can, but is effective against level loss that even restoration can't undo (including levels lost due to death, but not the negative levels bestowed by magic items such as a holy weapon). When a user's experience has been stored within the bottle, he can subsequently access the bottle to restore his XP total to exactly what it was when it was last stored, negating any levels lost in the interim. Storing experience in the bottle is difficult, and the user must pay 500 XP (deducted before storing) to do so. Only the creature that stored experience can retrieve it, but if the bottle is destroyed or lost, the user suffers no ill effects.
Restoration
This spell functions like lesser restoration, except that it also dispels negative levels and restores one experience level to a creature who has had a level drained. The drained level is restored only if the time since the creature lost the level is equal to or less than one day per caster level. A character who has a level restored by restoration has exactly the minimum number of experience points necessary to restore him or her to his or her previous level.
hmm ... You're saying Thought Bottle works like Restoration and Restoration works on Negative Levels and Levels Drained only. So the more casual tricks using the TB that don't include these specific things, don't work ... without this workaround you posted (or another).