He should keep his opinions to himself, if he’s presenting himself as a Catholic priest and giving the opinion based on his position.
I’m in favor of women priests, (un)fortunately Jesus and his Apostles settled the question for Catholics and Orthodox. If Anglicans and protestants want to call their ministers “priests” and place women in those positions - it has nothing to do with us and frankly, I favor it, since in those communities, there is no distinction between the roles of a male minister or female minister.
I’m also in favor of female roosters, male cows, female bulls, male hens, and other interesting combinations - (un)fortunately, the English language has settled the matter. However, language does continue to evolve.