Here is the original statement about special treatment:

"It was originally created by Microsoft and as Herb mentions "all our target platforms", so most likely it gets special treatment."

My claim is that Microsoft is not giving any special treatment to the GSL... the GSL is written using functionality that is officially available to any third party library, and hence not special.

Are you disputing this? If so then what is the special treatment you're claiming that Microsoft is giving to GSL or what special treatment is GSL making use of?