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Yes luther strode is just superhuman, when compared to haki. But Hecules method at the fundamental level is on that gives you complete control over your body. Strength is not just having muscles but also about how efficient and effective your are at using it. If a human in one piece world has it, they gain strength easily and even control haki (atleast armament haki) to high level. Garp without haki is still strong, but within the human limit for a human in one piece world, now imagine a human in one piece world with Hercules method who could easily overcome their limit. Then imagine what a Saiyan with Hercules method could do.