Correct. Boston is a net downhill point-to-point course and not record eligible under World Athletics rules.
replyNo point to point courses are eligible, because of the "risk" of a wind assist.
reply> Better weather has, to the best of my knowledge, never been part of marathon record keeping.
replyIt should be.
Human response to temperature shows significant variation. 50F/10C may be absolutely ideal for one runner, but a little too cold for another. That's why you can't unambiguously declare a given race to be "a good weather day".
replyBy contrast, hail/rain and wind will negatively impact almost everyone, which is why talking about "a bad weather day" makes more sense.