In fairness, the author should've known something was up when they thought they could put a multiple year newer chip in an Intel board. That sort of cross-generational compatibility may exist in AMD land but never in Intel.

I mean sure, that would seem suspicious. But not suspicious enough that I'd likely have caught the problem. It's not that far fetched that Intel may occasionally make new CPUs for older sockets, and when Intel's documentation for the motherboard says "uses socket FCLGA2011" and Intel's documentation for the CPU says "uses socket FCLGA2011", I too would have assumed that they use the same socket.

The author would likely be able to put a v3 generation processor in the motherboard, they just didn't do the necessary research to find that out before pulling the trigger.

It sounds like you've never heard of Socket 370 or Slot 1.