That elevator for GO has been out of service for at least 3 years if not longer.
Of course, there is no official source since no one wants to post things related to the Crosstown and GO station as well TTC not keeping info of things for it My last visit to the station was in Dec 2023 that been part of a numbers of visited to it as well using the SRT before it shut down. I photographed the entrance before it was hoarded up and several times since then, but not on my last trip.
One can say Yonge should be added to the Kennedy station and other stations that should be open now than later, but has a permit been issued to do that? Until a permit is issued for them, they must remain close to the public regardless of whether they should be open.