Good to point out, thanks. It's talking about a past study (past edition/version?) from the same source -- Anderson Economic Group.

It seems likely they used the same methodology in the 2023 edition and just updated some numbers, but you're right to point out it's not entirely safe to just assume that.

It's still not "garbage" to look at what people said about a past report on the same thing with the same conclusions from the same source.

One of the main things they point out in this fairly short piece, was that the report included an hourly rate for waiting for a charge was included. That seems to be true in the 2023 "edition" too. That may or may not be "fair" to include, it's a matter of opinion I suppose, but I definitely didn't realize it was a major part of their "expense" calculation until someone pointed it out. (A commenter in the thread here also points it out).