I'd agree with you had they used a weasel-word like "virtually", but "essentially" seems appropriate in this case: adverb: used to emphasize the basic, fundame

I'd agree with you had they used a weasel-word like "virtually", but "essentially" seems appropriate in this case: adverb: used to emphasize the basic, fundamental, or intrinsic nature of a person, thing, or situation If you didn't actually iterate through every position - but rather a subset that provided equivalent coverage by eliminating symmetries - then you have, in essence, solved every position.