I'd disagree, completely. Its just shitty english grammer.

The notion that somone might not "fit [a] mold", is a trivial comment. The implication that if someone mis-states this comment as saying someone might not "fit [the] mold" is simply the substitution of the definite for the indefinite article.

Put another way, there is no "literal" truth to the comment. There is not [a] mold; nor are there [any] molds that exist (in the literal sense) at any college. That whole expression is a figue of speech.

TLRD--this whole thing is about a fucking typo in an e-mail.