I agree entirely with what ScotlandX says below.
My use of the word “illegal” in my previous posting was a bit off the mark. But it seems that that the previous EC gave approval for changes to common property without the sanction of the Owners Corp at a General meeting or the insurance of an exclusive use by-law.
Whatever the case, as ScotlandX suggests, the best thing to do is move on and deal with the situation as it exists now. Executive Committees change every year and you can’t really fault the incumbents for wanting to run the building according to strata law.