Flaming_Spinach - If you can come up with an example newer than old, old, old school, then it would be able to favor your opinion better. Here are some examples of when they have reprinted a card, it meant the other form of it was going to be rotated out.
- Double Rainbow Energy was reprinted in EX: Emerald because it's only other form, in EX: Team Aqua/Team Magma was pretty much guaranteed to be rotated out.
- Lanette's Net Search was reprinted in EX: Emerald because it's only other form, in EX: Sandstorm was pretty much guaranteed to be rotated out.
- Wally's Training was reprinted in EX: Emerald because it's only other form, in EX: Sandstorm was pretty much guaranteed to be rotated out.
- Rare Candy was reprinted in EX: Emerald because it's only other form, in EX: Sandstorm was pretty much guaranteed to be rotated out.
- Oran Berry was reprinted in EX: Emerald because it's only other form, in EX: Ruby and Sapphire was pretty much guaranteed to be rotated out.
- Lum Berry was reprinted in EX: Emerald because it's only other form, in EX: Ruby and Sapphire was pretty much guaranteed to be rotated out.
- PokeNav was reprinted in EX: Emerald because it's only other form, in EX: Ruby and Sapphire was pretty much guaranteed to be rotated out.
- Double Full Heal was reprinted in EX: Emerald because it's only other form, in EX: Sandstorm was pretty much guaranteed to be rotated out.
- Professor Birch was reprinted in EX: Emerald because it's only other form, in EX: Ruby and Sapphire was pretty much guaranteed to be rotated out.
- Balloon Berry was reprinted in EX: Deoxys because it's only other form, in EX: Dragons was pretty much guaranteed to be rotated out.
- Lady Outing was reprinted in EX: Deoxys because it's only other form, in EX: Ruby and Sapphire was pretty much guaranteed to be rotated out.
- Strength Charm was reprinted in EX: Deoxys because it's only other form, in EX: Team Aqua/Team Magma was pretty much guaranteed to be rotated out.
- Energy Removal 2 was reprinted in EX: Fire Red/Leaf Green because it's only other form, in EX: Ruby and Sapphire was pretty much guaranteed to be rotated out.
- Energy Switch was reprinted in EX: Fire Red/Leaf Green because it's only other form, in EX: Ruby and Sapphire was pretty much guaranteed to be rotated out.
- Poke-Ball was reprinted in EX: Fire Red/Leaf Green because it's only other form, in EX: Ruby and Sapphire was pretty much guaranteed to be rotated out.
- Pokemon Reversal was reprinted in EX: Fire Red/Leaf Green because it's only other form, in EX: Ruby and Sapphire was pretty much guaranteed to be rotated out.
- Potion was reprinted in EX: Fire Red/Leaf Green because it's only other form, in EX: Ruby and Sapphire was pretty much guaranteed to be rotated out.
- Switch was reprinted in EX: Fire Red/Leaf Green because it's only other form, in EX: Ruby and Sapphire was pretty much guaranteed to be rotated out.
As you can see, in most examples, cards that had been reprinted were because the older forms of it were going to or already were rotated out of the modified. Your one example that isn't relative to current times doesn't even scratch the life herb theory.