That's temporary, due to unexpected staffing change. Most clubs only allow 2 teams max. Coaches often get creative in earning extra income.
I don't believe that is a temporary thing at Strikers Irvine. Roy Chingirian has 3 teams, George Ba has 3 teams, Michael Collins has 3 teams, etc. It is what it is. Coaches normally coach 3 teams so I am not so sure why you are so shocked.