Seems a bit of a mish-mash to me? Is it "enforceable"? Seems not:-

"The UK Government reaffirmed its support for the GCM in response to a number of Parliamentary Questions in November 2018. It has stressed that the Compact is a “non-legally binding, cooperative framework”, which “reaffirms the sovereign right of States to determine their national migration” policy, while setting out “a better international framework for action and co-operation on migration” It has also referred to important commitments set out in the Compact to tackle human trafficking and people smuggling, the recognition of a State’s right to control its borders, and acknowledgement of States’ responsibility to accept the return of their nationals who no longer have the right to remain elsewhere."