Re: What does this mean?
No problem Justin.
Tight slot - and approach speed is determined at least in part by VREF, which is 1.3 x VS0, so what you say is equivalent although I think you are wrong in the specifics. It is reference speed not approach speed (which might be higher) that is the determining speed.
If you look at the JAA ATPL suyllabus what I said was entirely correct. I admit that doesn't necessarily mean it is correct, but given the forum it probably means it is the best answer, and since yours is equivalent I still don't think I have been shown to be wrong. I did not teach performance so I could not say so definitively, but I did teach ATPL flight planning, and in the Jeppesen manual we used was a table of categories - all based on 1.3 x VS0.