AxMap.ReSourceLayer not in 5.2
From MapWinGIS Discource issue AxMap.ReSourceLayer not in 5.2
The definition for ReSourceLayer was inadvertently removed from the IDL file back in Commit 3404cb5a, dated 3/14/2019, thus no longer being publicly available (although it could still be used internally).
ReSourceLayer has been added back to the IDL file. All other code was still in place.