Once its available? WTH does that mean?

Is anyone else experiencing this? I've noticed this trend over the last couple of weeks. Things labeled as Amazon Prime aren't really Prime.

For example, I'm looking for some new flood lights. I choose Prime as my filter. These lights pop up, which I know are/were good because I purchased them 10 years ago and they worked great. However, look below the 1 click button for the arrival time.