Correct, and if you do that, methods will invariably end up small.
If you'd said "usually", I'd have agreed with you, but "invariably" is far too strong. Sometimes the logic you need to implement is fundamentally complicated, and so the code you write to implement it must inevitably be at least that complicated. If that means writing a 100 line function, but the function really is doing one job, at one level of abstraction, in a cohesive way, then so be it.
If you'd said "usually", I'd have agreed with you, but "invariably" is far too strong. Sometimes the logic you need to implement is fundamentally complicated, and so the code you write to implement it must inevitably be at least that complicated. If that means writing a 100 line function, but the function really is doing one job, at one level of abstraction, in a cohesive way, then so be it.