It's an odd video series... IIRC, it seems that SMR continues to lead in performance. Makes me wonder if he bought a truckload of SMR drives at a deep discount and is now looking to move them, lol.
Maybe he will try a comparative RAID rebuild video. If SMR wins out there, I'm calling WD for an investigation.
Anyway... you're welcome. I find videos like this quite tedious when a brief paragraphic (or graphic) says it all. But to protect others, I may post using "SPOILER" tags to keep the "suspense" in play.