The comment I replied to mentioned that the mistake had been made "consistently upstream" -- I took this to mean that he has seen this mistake made multiple times by multiple people, which would indicate an alternate spelling has emerged, or that the two words have come to be spelled the same way.

And the comment about loose as a verb was a reference to the fact that the correction was not even necessary -- we can all get by with each other's occasional errors in typing. In this case, the error was so minor it didn't even affect the meaning of the sentence.

I'm a firm believer in avoiding any correction to adult speech, typing or spoken. People will use/abuse/misspell words no matter what, and pointing them out is merely an exercise in self-superiority.