Is "Diet Fatigue" a meme?

Saw video from Dr Hammer Head he said after 8-12 weeks of dieting you should do maintenance for like 8 weeks, then another 8-12 of dieting. Looking back to my past diets, they all did fall apart after 8-12 weeks. Wondering if I should do that also. Just started week 6 rn, so would be in another ~7 weeks. Down like ~10 pounds rn.