There is no discrimination from what I've read.
The pilot in question had an event while flying. The BOD considered this a safety threat and required him to have a qualified pilot as a spotter.
It would have been discrimination if several pilots had those type events (keel over) and he was the only one required to have a spotter. If in the future another member of the club has a similar incident, the BOD must require a spotter for them also or there would be grounds for lawyer involvement.
It's going to be ugly at the club for a while.

Fritz