Network Rail Western tweeted yesterday about a celebration on completion of that exit, which will now be mothballed until opening in 2026 once the University completes their new build.
It does seem odd that this work was done and completed so early in the scheme of the whole development
IIRC▸ they had an opportunity to build the underpass whilst the East Junction trackwork was being done so took it. Also it was likely a lot easier to be delivering materials to site, craning in steelwork etc. whilst the University work was ongoing, and finallythe University can then build their public realm around the station.