Thanks - that's what I have too (there's an unchecked 'i' in the first rejigged entry but it belongs to the original answer).
One possibility is in a short down answer - the first letter is unchecked and could make a thematic word we often see in crosswords, but the original doesn't seem to equate). But one of the longer downs has a change that isn't justified in Chambers (although I've seen it in its thematic context).
That apparent error in the preamble could be fixed with a simile (but, again, I can't find any justification for this).
I also have an issue with the very last part of the endgame - the ''equally valid conclusion'' doesn't work grammatically, if it's supposed to read on.
My cofidence is waning (but it is Kruger, and I suspect he must be right).