Without more clinical information and the basis for your friends diagnosis, I cannot comment on whether this was a misdiagnosis or not
Some types of ALS can be quite slow in progression eg Progressive Lateral Sclerosis. I do not know if this was your friends diagnosis or not
If he/she is in doubt, maybe you could seek a seconds opinion. If you are in the cleveland area, the Cleveland Clinic ALS Center could do that for them (Dr. Erik Prioro)
Good luck
Kind regards
stenik