I've accidentally stumbled upon the --no-compiler-signature directive that you can use to make your generated Delphi executable slightly smaller.

Add it to the "Additional options to pass to the compiler" in project options -> Building -> Delphi Compiler -> Compiling node, and not only can your generated file reduce a little bit in size, it can also remove the string "Embarcadero Delphi for Win64 compiler version" away from the generated file.