Thanks for the link, I am very underwhelmed too.

If I understand it correctly, one suggestion is equivalent to choosing some X, and re-scaling everyone's utility function so that X has value 1. Obvious problem is the arbitrary choice of X, and the fact that in some people's original scale X may have positive, negative, or zero value.

The other suggestion is equivalent to choosing a hypothetical person P with infinite empathy towards all people, and using the utility function of P as absolute utility. I am not sure about this, but seems to me that the result depends on P's own preferences, and this cannot be fixed because without preferences there could be no empathy.