Not being argumentative here, I would appreciate an answer.
"How is it he can be removed"? Quite simply. The Church in the person of his Bishop can deny him faculties. He can be suspended from ministry, or in an extreme case, he can be completely discharged from the exercise of the functions proper to the ordained state. The latter is sometimes colloquially called "defrocking" or "laiciziation".
Why are other priests not removed? I'm not sure of whom you're referring to but it is at the discretion of the Church and would depend on the particular circumstances and clergy in question.
You wrote:
“How is it he can be removed from public ministry, but other priests who have sexually abused children are not removed?”
Actually all priests who are even accused of sexual abuse of children are removed from public ministry pending the outcome of the investigation.
You clearly didn't read the article. He was removed before these sexual abuse allegations came to light. The cause for removal was custodial interference between the alleged victim and the teen's grandmother.