I was playing around with some of the operator blocks, and I dragged an addition reporter into another. The highlight around the blocks became red, and one of the reporters became a "sum" reporter. What happened?
You hovered over the arrowheads at the end of the inner block, and instead of providing inputs to that block one at a time 
you gave them all at once 
. Nothing to do with the linguists' use of asterisk to flag ungrammatical text (i.e., no native speaker of the language would say it that way).
Oops. I attached the wrong photo. I'm sorry. LOL.
I updated the post with the actual photo.
Yeah, so when you use a single list of numbers as the input to + instead of using two or more separate numeric inputs, it no longer makes sense for the block to have an infix name. In this case, SUM gets the meaning across.
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