They did say at the beginning of the video that it shouldn't be taken very seriously and that it may trigger some people
I've been driving a 991.2 TTS for the past couple of days and my butt dyno said power definitely drops off after 3rd gear compared to the M5 (a tuned M5). My colleague, who has been driving my M5 for the past couple of days also confirmed the M5 feels faster past 100mph (or sooner than that even).