The software accepts words longer than 2 characters - doing a search for edit vi grep will still give the error. Even if you quote "vi" you get the error. That is what the person is complaining about.

Here we actually have someone who is willing to search first, and can't!

I think this is something Neo would have to make a call on - 3 letters is probably the default but UNIX has commands with only two letters (cd, vi , ed, ar, at, mt, lp, bc, dd, du, ln ...) which folks may be adding to their search.