No, he's wrong.
There is a certain bridge (only one that has to be altered), which will allow 13 - 18+ multis to be accessed by the dip switches present on the 7VAXP.
You will have to either close or open ONLY ONE bridge. Normally the motherboard can only achieve 5 - 13 on your current CPU.
Please someone help out, I can't remember off the top of my head which bridge needs to be changed.
But rest assured, you don't have to change the bridges EVERY time you want a multiplier change. One of the CPU bridges accesses 13 and under, by altering that same bridge, the motherboard can get 13 or higher.