This seems like a way of trying to coax non-union employees into joining a union, or just another sign of things to come under "That One".
Don't know the specifics, but from my own experience doing labor law it is probably a bit more complicated than that. Most likely by "Non-union" it means $55K+ employees who are not even eligible to join a union, but are 'bargaining unit exempt' because they are supervisors or confidential management employees.
I have no personal knowledge or opinion as to whether it's a reasonable idea under unusual circumstances, or just more socialist 'Everybody earns the same' BS in this particular situation, though. I have a guess, since it's Albany NY, but I'll bite my tongue.