At night, IFR or VFR, given that terrain, wouldn't you just do anyway what the VOR DME approach plate says, whether you had it or not?
The electronic misdirection is an intriguing possibility, but I don't think we would ever find out about that unless it happens there again. And the likelihood of in-aircraft interference depends on how you assess the likelihood of a dozen people clattering away on their old laptops and chattering away on their old cell phones all at the same time. Pretty unlikely, I would guess.
PBL