That's
not how I understand it. The document appears to be suggesting that all 14 first class units are to appear overnight at the end of 2024 to the final specification. As far as I know, the seat plan for that 'final specification' is still this (so quite unlike coach D on a Virgin 221):
View attachment 119735
However, it appeared to be the intention to introduce the units (or some of them) into service before that date with that first class section declassified. However, there was a possibility that some of the units would be delivered with the first class section not simply declassified but actually with a different seating layout (presumably much closer to the standard class layout) in that section. This temporary standard class interior would presumably then be stripped out and replaced by the first class interior (which is what I meant by 'quickly refurnished').