Jack: "Do the Office 2004 rules also apply to Office X?"
I am not certain Jack, but it's my guess that they do, especially as Office X and Office 2004 are so similar, at least from a Word perspective. And, I presume the underlying concept is the same, ergo, 'tis probably best to leave those fonts alone.
Still, if you must, I recommend you use Font Book to disable the fonts rather than physically deleting them. That way, should you later find they are wanted, they can easily be (re)enabled.
AFAIK, mucking about with fonts can lead to disaster, unless you really-really know what you're doing (I don't, thus my conservative approach).
OTOH, it affords one the opportunity to learn about Kernel Panics, assorted Office chaos, recovering lost data, and reinstalling/custom installing Office & fonts.
Please be careful, or at least have a verified backup before you venture forth.