I only agree with two of those. Diet is EVERYTHING. You are in caloric deficit, so it's actually time to REDUCE volume while switching to bigger compound movements so you can maintain strength and be efficient with what you are eating. Shorter rest periods are a must, but why lighten the weight? Lift the heaviest weight possible, as it's the most metabolically challenging. I'm guessing you've never had to really go on an extended cut. I might be completely wrong, but those are the people on these forums who will typically just throw out something like complexes having never tried them themselves, because they've read how good they are for conditioning.