Is this reasonable? Under what conditions would a pilot choose to dump so much fuel that reaching an alternate would be impossible? Indeed, this scenario seems to raise the question of whether it is safer for a two-holer with one out ever to choose a dodgy land-ASAP location rather than continuing on on one engine to a far more assured airport.
Well presumably the choice was either dump to get below max landing weight or accept the possible consequences of making a landing above Maximum Landing weight.
I'm not sure of the relevance of the two holer comment, seems to me you could get the same problem on a three/four holer if you were dealing with a diversion to a remote/isolated alternate.