QUOTE
"But as you can see from the above the purely statistical definitions are not the only "right" ones."

That's right, and that's yet another reason for avoiding using the term to characterize the occurrence of mutations. One may become confused... ;-)
UNQUOTE

I seem to remember the Old Foole rambling on about not smearing multiple different semantic concepts (meanings) onto the one semantic label (word) ... -> GIGO ... :-)

:-P