Yes, the glitch still works with Stranglehold after NXE.
Just follow these instructions. You will do the glitch during the loading sequence for any level. So from the main menu, load a game, and as it is loading do the guide glitch.
And I know it works because I did it a few months back to get the normal, hard, hard boiled achievements.
Note: You will want to have EVERYTHING done before you do it, cause they will pop out of order. I tested it on a dummy profile first and noticed this. So do everything on casual, then pop the last 3 difficulties with the SPG.