They are visible and bookable. I just booked two seats on LX80 for July 6. The AC booking page was showing 6 open seats in the morning and 4 before I booked mine. Seats in J are available on several dates at the beginning of July. The flight is not ideal for connections from Europe since it departs fairly early (09:55), but it costs 21.5% of the points needed for the AC flight departing few hours later. At least on the route I booked (KSC-VIE-ZRH-YYZ-YXU).