It is long, absolutely. I wonder if you actually read the whole thing or were paying attention when you approached the end. I'll pull out a few bits for you that you may have glossed over:

The evidence above adds up to a serious case that the SARS2 virus could have been created in a lab, from which it then escaped. But the case, however substantial, falls short of proof. Proof would consist of evidence from the Wuhan Institute of Virology, or related labs in Wuhan, that SARS2 or a predecessor virus was under development there. For lack of access to such records, another approach is to take certain salient facts about the SARS2 virus and ask how well each is explained by the two rival scenarios of origin, those of natural emergence and lab escape.

So he's got nothing, but will happily settle for reasoning through his ideas to land on a preferred conclusion anyway.

Neither the natural emergence nor the lab escape hypothesis can yet be ruled out. There is still no direct evidence for either. So no definitive conclusion can be reached.

Seems pretty clear to me. Then he adds a long long spiel "But, I still think it was made in a lab because..."

I also like how he wrapped it up in a pretty bow with a blurb about we can't understate the importance of the left-leaning media's ideological insistence that anything Trump said can't be true.