That study merely measures palatability. It even says:

Based on these owner-reported behaviours, our results indicate that vegan pet foods are generally at least as palatable to dogs and cats as conventional meat or raw meat diets, and do not compromise their welfare, when other welfare determinants, such as nutritional requirements, are adequately provided.

Please provide the results you found that lead you to the claim you made around palatability and nutrition.

The ones stating that the food is enjoyable.

Where did you find those results?

What are the results of those measurements?

Is the food palatable and nutritious?