The problem therefore is not how to scale PR review and rather how to select meaningful work to perform, which brings me to the second point made by TFA: humans making judgment calls on whhich PR should be prioritized being a uniquely defining human feature.
I beg to differ here as well. All the problems described in the article are high context decisions, you need to take a lot in consideration (user request, product strategy, market dynamics, cost/benefit, rou..) to decide which feature should be prioritized in the next release. What prevents LLMs from being able to help with that is the sheer amount of information to ingest which is a still a limitation despite the long context windows we see nowadays.
tl;dr: this is a problem of prioritization and product strategy and nothing specific to AI. Scaling so-called judgment is a red herring and better focus and scope management should be aimed for instead.