GRT is 2x as well.
The 1x is stated as that chainring is biger and sits more towards the frame. And bigger sizes (of 1by) currently do not fit).
I have my eyes on it as well. And also want to set it with 2x Di2. But nobody can say the tyre clearance in the rear with Di2 FD. Probably less than 57mm, but not necessary. My Addict Gravel is more limited by chainstays, than with FD cage.
Also, hopoefully someone can also confirms, that frame has a hole for Di2 wire for FD. Funny, Evolve Cima GR is also 2x, but reports say, it has no FD wire hole, so it is only Sram possible.
That also makes me wonder, if GRT Shimano battery goes in the seatpost, or somewhere else.
@Requiem84, maybe you can explain a bit further?