Summary:
This mod allows you to bypass the 20 food level and saturation limit. However, a vanilla logic will prevent you from eating most of the food available when you are full. This also does not prevent a vanilla logic that prevents saturation from being higher than food level.
This formula from vanilla shown below is responsible for limiting saturation equal or lesser than player's food level:
Final Saturation = Math.min(Saturation (from food) + Saturation (player's saturation), Food Level)
No, the extra saturation and/or food level is not rendered.
