There is a basic principle of canon law the he is following:
Can. 1339 §1. An ordinary, personally or through another, can warn a person who is in the proximate occasion of committing a delict or upon whom, after investigation, grave suspicion of having committed a delict has fallen.
§2. He can also rebuke a person whose behavior causes scandal or a grave disturbance of order, in a manner accommodated to the special conditions of the person and the deed.
§3. The warning or rebuke must always be established at least by some document which is to be kept in the secret archive of the curia.
Can. 1340 §1. A penance, which can be imposed in the external forum, is the performance of some work of religion, piety, or charity.
§2. A public penance is never to be imposed for an occult transgression.
§3. According to his own prudent judgment, an ordinary can add penances to the penal remedy of warning or rebuke.
Not saying that removing this gentleman from his duties as cantor, lector, and choir member is a “penance”, per se, but in having a public ceremony where he affirms that he is committing sodomy with another individual, he is taking his private life (occult) and making it very public. Like he’s saying, “In Your Face, Church”.
The Church needs to have a public response to such a public challenge.
It would be interesting, if possible, to get Fr Marcel Guarnizo’s reaction to such a thing.