He has no shortage of reasons, although not all of those cited carry equal weight.
Only God is perfect, and bishops, even the best ones, fall far short of the One who is absolutely perfect. Therefore, they may be very right in some of their actions and statements, much less so in others, and even completely wrong in some. They must be judged as excellent, good, fair, or poor based on the overall balance. This does not exclude the possibility of praising the good and criticizing the bad. Nor does it mean exaggerating the good or the bad beyond their actual merit.
Munilla is a bishop whom I believe has a very favorable balance, but that does not rule out errors or mistakes. These may come from the bishop himself or from those who attribute them to him, with greater or lesser accuracy. I believe this introduction is helpful for reading the article in question, which, for my part, I am not in a position to judge as right or wrong.
It is certainly critical.