Always be mistrustful of product info when the site sells it. Especially Amazon. They sell far
too many things to focus on correctness on any single one. Ballpark
numbers are good enough for them when money and not correct product info
is the priority.
Also, net info changes. 10 years ago, I used
the same process to dig up info as I do now - use multiple sites to find
info consensus. At the time, the majority said 1981. The consensus now
is that this EP was released 8 Nov 1982. If nothing else, the label on the original vinyl (which wasn't findable 10 years ago - not by me, anyway) also says 1982, so I need to go with that.
Some of the singles are from 1981, but this page is for the EP that combines them, and apparently that's from November of '82.