In the last paragraph of the commentary there is a discussion of Mill's belief in the existence of truth. It is my opinion that the way this last paragraph was written does not adequately represent Mill's understanding of truth. The commentator confuses moral truth and utilitarian truth. The commentary assumes truth on the basis of simple right or wrong, but Mill was a utilitarian. I believe Mill's understanding of truth is one where the 'trueness' of an idea is weighed by its ability to serve the greater good. (The effectual utility that this idea has within a society) Given that the utility of an idea to a group of people may change from region to region, and over time, Mill does not assume the absolute truth assumed in the commentary. The only truth is one that provides the greatest amount of happiness to the most number of people.
Feel free to disagree