Maybe I missed it, but I didn't see any reference to the actual vacancy rate in this article, just mostly anecdotal comments about increasing incentives to rent which given some larger projects recently completed may not be a surprise as they want to fill their new buildings as soon as possible.
Yes, I suppose if the building trend keeps up and if fewer people move here, there could be a glut, but that is a couple of ifs and a could. Maybe the Journal headline writers missed the word "possible future" glut in their headline, their headlines have really become very lazy, sloppy and misleading.