Dsm101 is absolutely correct to say that the preamble is inaccurate in relation to the resolution of ambiguities. It didn't cause me a problem because I surmised, as everyone else has done, that the final grid consists of real words, but that doesn't alter the fact that the wording of the preamble is wrong in relation to 6a and 44a.
Presumably the setter didn't want to reveal prematurely that the final grid consists of real words. All that was needed was a minor caveat, and maybe a reference to the puzzle's title to resolve the last few ambiguities.