It is a matter of semantics.One will say the draw length increases by 1 1/2",another will say the BOWS draw length hasn't changed according to AMO standards.
Regardless,the shooter becomes overdrawn which is a draw length issue so draw length is affected by the loop.
I ask you,what happens if you go from not having a loop to shooting with a loop? Will the draw length of the bow need to be shortened to maintain proper form?
Anchors change,that is a given but what else?