Crawl spaces are subject to many debates on whether to insulate, seal off or vent.
Personally I think crawl spaces and venting is a think of the past. I live in a very old house with a crawl space, vented and with a “soil / sand” floor. It’s a challenge with respect to winters and venting… Pain in the *****
I believe it’s where you reside in the country and how you condition the space.
No one system is perfect for the entire country.
Check out this link:
As for the photo. I believe it maybe the wrong approach due to condensation that will be trapped on the “plastic” (if it is) attached to the (cavity side) surface to joists… Warm moist air from the living space above will settle on the plastic surface in contact with wood and if the crawl space is vented. More problems…