Here's why:
* Synchro Summoning Conditions: Synchro Monsters are Summoned by using the "Synchro Summon" method, which requires specific conditions involving "Tuner" monsters and non-Tuner monsters. This method doesn't involve removing monsters from play.
* Removal from Play: The "Removed from Play" zone is a separate zone in Yu-Gi-Oh! where cards are sent for specific effects. It's not a typical summoning zone.
* Special Summoning: Special Summoning has its own set of rules and conditions. Removing a card from play is not a standard condition for Special Summoning.
In summary: The Synchro Summoning mechanic and the "Removed from Play" zone are distinct parts of the game, and there is no rule that allows Synchro Monsters to be Special Summoned from the "Removed from Play" zone.