According to Metrolinx, they are still actively developing the planned connection from Renforth to Pearson for the Eglinton West LRT with the GTAA. I wonder how this affects this project.
I wonder if they can design the incoming track in such a way that it can be diverted into a "temporary" LRT station at the airport. Once the hub is built, the track can be realigned into the permanent platforms inside it.
I know it's not directly comparable because this would be a new build and not a replacement of the existing facility, but something like what San Francisco did with the Transbay Terminal. The temporary terminal was in operation for 8 years until the new, permanent one opened.
I'm sure there are probably other examples out there of new transit lines going into temporary stations while a new, larger multimodal facility is built nearby.