In re-reading my post on Prof. Fish's attempt to correct the syntax of an AT&T call center employee, I'm led to wonder whether his cri de coeur ("It is a factual matter as to what is and is not syntactically correct") is itself syntactically correct.
The basic construction here is what is traditionally called "extraposition from subject" (see e.g. here for further discussion and examples). It involves an expletive pronoun it (sometimes also called a "pleonastic" or "dummy" pronoun) in subject position, standing in for a sentence-final clause that might have been the subject:
It's a shame that things turned out so badly. = That things turned out so badly is a shame.
It's not clear what she wanted. = What she wanted is not clear.
It's odd how well the timing worked out. = How well the timing worked out is odd.
So the sentence "It is a factual matter what is and is not syntactically correct" would be normal, though awkward because of the three repetitions of "is", the hard-to-parse "and", etc. The version with the what-clause in subject position would be "What is and is not syntactically correct is a factual matter". However, adding "as to" between "matter" and "what" is not only redundant, but (it seems to me) probably ungrammatical.
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