[whalee]

Not at all. Vanishingly few things during the development process of a novel thing have truly objective measures. The world is far too complex. We all act and exist primarily in a probabilistic environment. A subjective evaluation is not so different than simply making a prediction about how something will turn out. If your predictions based on subjective measures turn out to be more correct than others, your subjectivity is objectively better.

Hence the author's main point: a good taste is one that fits with the needs of the project. If you can't align your own presuppositions with the actualities of the work you're doing then obviously your subjective measures going forward will not be very good.