Probably just a nomenclature thing with the city's processes. Approvals in Calgary kind of go in 2 stages. There is "approved" and then there is "released". Basically, you can have your development permit approved with several outstanding conditions (usually money for infrastructure upgrades, or a minor change to the plans that don't change the design in any way). What likely occured was this project was "approved", the developer is now getting ready to move forward with construction so need to get it "released", and have submitted everything necessary for that, which puts it back into circulation for review.