Voting against the regulations means he did not want them to pass, but they did. They were repealed this year, which logically he must have been happy about. Unless he publicly states otherwise, it is fair to conclude that he is happy with the most direct obvious consequences of the repeal.
In theory it's possible that Pai supports the goals of the regulations but disagrees with the means, but has stayed completely silent about his support and made no effort to accomplish the goals through more appropriate means. There is no meaningful difference between that and simply opposing the regulation because he doesn't like its goals.
Voting against the regulations means he did not want them to pass, but they did. They were repealed this year, which logically he must have been happy about. Unless he publicly states otherwise, it is fair to conclude that he is happy with the most direct obvious consequences of the repeal.
In theory it's possible that Pai supports the goals of the regulations but disagrees with the means, but has stayed completely silent about his support and made no effort to accomplish the goals through more appropriate means. There is no meaningful difference between that and simply opposing the regulation because he doesn't like its goals.