No it can't. That's GP's point. We can reason that one gymnastics skill is more technically difficult than other skill, with various degrees of certainty. We cannot reason and especially codify the same for poetry or its component parts.

there are existing olympic sports with "artistic" scoring components, and poetry was already in the olympics for nearly 40 years... ya'll are overthinking this

What? They started giving examples of exactly how it can be codified.

Their point was that it would likely produce uninteresting poetry, not that poetry can't be judged by some set of metrics.