Quite right: Justice Mahon's findings as to the cause of the accident still stand today. So do numerous other bad judicial decisions.
I don't understand the reverence in which this gentleman is held. As to the cause, he spent many months hearing evidence and tripping around the world (including a pointless trip to Antarctica), yet still managed to come up with the wrong answer. The taxpayer paid two lawyers to assist him as well as an aviation expert, all of whom recommended attributing a portion of the blame to the crew, particularly the captain. He ignored that advice, because he had developed a series of conspiracy theories, which culminated in that ridiculous "orchestrated litany of lies" comment.
The end result of His Honour's efforts is the only CFIT accident where the crew were entirely blameless. In other words, TE901 was doomed from take-off.