Possibly, but not necessarily from scratch.
The issue for most skinny-fat guys isn't effort. It's that the training structure isn't optimised for their body type. Too much cardio, not enough resistance work, wrong rep ranges, no progressive overload — these are the common patterns.
The guide and 4-week plan give you a framework built specifically around how your body responds. Whether you need a more wholesale reset or just some adjustments depends on what you're currently doing.
If you're unsure, post your current routine in Discussion and I'll give you an honest assessment.