That's not what he did. He synthesized from the primary sources text that contradicted the majority of all published sources on the incident, including what was up until then the most authoritative source. That obviously should not be happening in an encyclopedia.

But let's be careful about wording. It obviously shouldn't happen in an encyclopedia. But it obviously should be happening. And it did. He went on to write an authoritative secondary source and the article is sure to reflect it.