The correct term is tetrachampion, with tilde . It means he's won a championship four times. He has been a four-time champion (not necessarily consecutive). It has achieved 4 equal titles and porta 4 stars.
They must have wanted to write "what is tetrachampion", because not only is it poorly raised but also lacks all accents.
Team that has won 4 times Consecutive Competition, Tournament, World or League
A team that has won 4 times the competition which is being talked about.