Partially, but that's not my point, because now U.S. Citizens are being threatened - at least verbally - on U.S. Soil. Just 2 hours ago, a press conference talked about Trump wanting to do the same thing to home-grown citizens [1]. Today's practice with Garcia is not just an appeal to the "slippery slope" argument (in case anyone wants to call fallacy, I'm shutting them down ahead of time), it's an appeal to the fact that Trump is actualizing the slippery slope and discussing - literally less than a week later - how he wants to use this situation as precedent to do the same to home-grown criminals - American citizens.
Also, Garcia was granted protected status to remain in the US, and had a separate court order saying he specifically couldn't be sent to El Salvador. They are no longer saying it like it is. Will they for us?