Yeah, I think they’ve mixed up linear regulators and buck converters. Buck converters are often more efficient with a larger voltage drop because the switch can run with a lower duty cycle.
Thanks, I never knew why. All I knew is whenever I need a buck converter in my DIY, novice PCBs, I just toss in an off-the-shelf preassembled one, with a small LDO on my actual PCB to drop the last bit and smooth it out.