Not true. He will have 80% possession but can still easily lose against a superior opponent.
He needs a formation that will take advantage of this possession and the opponents weakness of formation.
4-3-1-2 should do it
------ST---ST------
--------AMC--------
---MC---MC---MC---
--------------------
-DL---DC--DC---DR-
attacking, up the middle, zonal, mixed passing, normal tackle, no counter, no offsides, own half.
up arrow on AMC
the 2 STs should be countered by his 2 DCs leaving the space open for his AMC