The young man who claims he did it released a video on YouTube this morning. He appears to be affiliated with the St. Boniface Institute, whose website states:
The St. Boniface Institute was founded to give Catholic laity the possibility to speak out. No to paganism in the Church! No to the globalist agenda in the Church! No to the ongoing destruction from within! From the heart of Europe, we want to fight for the restoration of our wonderful Catholic culture and traditions, for a church that follows our Lord and Saviour Jesus Christ!
Check out the video below.