That’s how it was explained in the past. Snapshots are taken from Bing, the optimization work is done, and it’s inserted into the sim, usually along with world updates. If it worked like Jorg explained it, we’d be seeing the same images in MSFS as we are in Bing, and this forum thread wouldn’t exist.
I can quite guarantee you that in my region (no PG data), the MSFS imagery is 5+ years old. I see areas that have since been built up as empty areas or ground just breaking. We have a bridge that opened 2 years ago that took them 3 years to build. In MSFS, all you see is the ground cleared, which happened about 6 years back. Yet if I check Bing, the imagery of the same areas is current and about a year old and shows the completed bridge.
It’s not real time data.