Metapedantry: this is just how language works. Meaning 1 of "binned" might mean "sorted into a bin," but meaning 2, "inferior component separated out from the main production run" is now well established.Pedantry exception: there isn't an unbinned part. Binning is the process of separating a production run of parts meant to be the same into groups based on their post production results. Either all parts are binned into multiple part numbers, or all parts are unbinned and have the same part number. In this case they're all binned.
Technically, this is an example of degenerative semantic drift, the same way in which "silly" used to mean "happy." There was likely a period of time when both meanings coexisted, but generally a pejorative usage drives out a neutral usage. I think meaning 2 is already top of mind for most of us at this point.