It happened sometime either late-2022 or early-2023, I was directly involved in the project. You can also verify it the City of Calgary Map Gallery - https://mapgallery.calgary.ca/. I used myProperty which also shows some of the associated parcel addresses that use Stampede Trail; https://mapgallery.calgary.ca/apps/d9fcb476b89f41b397f03cd63bb710c4/explore.

Olympic Way SE still remains between 9 & 12 Ave SE.

There were some new signs that went up at 12 Ave SE that show Stampede Trail.