You don't need to remove the fan shroud to get into the tensioner. It's a bit of a tight squeeze, but you can do it.
While not necessary for the job he has in store, you most certainly can remove the fan shroud on a 5.4 NBS without removing the radiator. I did it when I changed the fan clutch a couple months ago. Took some wiggling and all, but it will come out and go back in.