Well, it would be interesting if you post those "proofs" here as screenshots, I am curious as well as developer. I didn't know it uses RDP.
Also "AmdPowerXpressRequestHighPerformance" and "NvOptimusEnablement", those aren't commands to be called, those are just exported strings for drivers to enable dedicated GPU instead of integrated GPU on notebooks.
If you are so concerned about security and stuff, go ahead and make code review and compile it yourself:
https://github.com/diznq/sfwcl
As for game.exe (launcher):
https://github.com/ccomrade/c1-launcher
Anyways, if you have trouble with game.exe forcing dedicated GPU instead of integrated, just use original Crysis.exe (game.exe is meant to solve troubles with AMD CPU users anyway)