Even if I'm wrong (and I hope I am) about bikes being expected to take that turn, I wonder what the intention is further down. Are bikes supposed to use that widened sidewalk, or the busway?

If the former, it needs a centerline (or similar "this is a multi-use path and not a sidewalk" indicators), and they'll need to do something about bike traffic running into the crowds of people waiting for buses outside the T station. If the latter, they should stripe a bidirectional bike lane down the left side, assuming there's room next to the buses.