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I think that the guys from Nival are absolutely not stupid. If tests were conducted, then conclusions were drawn not on the basis of guesswork, but on what was obvious. [Although it should not be forgotten that Nival is the creator of Demiurges, and besides, Heroes 5 was most likely made on an upgraded engine of Demiurges.] And in Demiurges, the battlefield was actually 0x0 – well, this is a completely different game. By the way, they cleverly calculated the size of the battlefield in previous parts
here; great review.
In general, I believe that Nival can be trusted, although not 100 percent…