BFreaky is using the Euro Style quick attach for the loader, instead of the Skidsteer quick attach. It's very common here. It's stronger and safer than the Skidsteer quick attach.
Basically, there is two hooks on top that engage on the top round bar. Then two eyes on the bottom, where two pins lock it in place. These pins are often moved by a single lever in the middle or on some commercial versions, it's spring loaded and locks automatically once the implement falls into place.
Here is the back of the bucket:
View attachment 664610
And the quick attach with the single lever in the middle and the linkage to the pins.
View attachment 664611
Thanks that sheds a lot of light on how this QA works, it does look like a good design with just one lever, I'll save those pics just in case someday I change my pinned bucket someday.