The likelihood is that those people did have fasciculations first. Of course, the fascics could have been BFS—having BFS doesn't prevent you from getting ALS. It doesn't make it more likely, either. If 1 in 200 people has BFS, then 1 in 200 ALS patients should report having fascics before getting ALS.
Put another way, how many people with brain cancer have headaches first, perhaps a year or two before the cancer? I doubt the headaches had anything to do with the brain cancer, but they certainly might seem so in hindsight. Same with fascics and ALS—unrelated in nearly all cases, but might seem so in hindsight.