It's not a given
Hi. No, that cannot be assumed.
Many types of arthritis
exist, and many factors go into developing arthritis (probably half of which are not known). I am not a rheumatologist, and they are pros at this, but I am no aware of piano playing or typing CAUSING arthritis. Obviously some of them will, but would they have gotten it anyway? Repetitive hand movements have been associated with carpel tunnel.