3-3-1-3 a dominant formation?

[thetoe]

I only noticed this guy's team because he bought one of my players. He is apparently playing the following formation

--ST-ST-ST--
-----AMC-----
ML---MC---MR
---------------
--DC-DC-DC---


His player quality is average. One 5-star player and three 4-star players, the rest mostly 3-star with a few lower.

He is absolutely crushing his league. 9-0-0 with 43 goals scored and 4 goals allowed. Has anyone tried this formation?

[Yasin Ali]

I've never seen anyone use it or tried it myself. It looks too attacking and open defensively.