No reason to take this in a personal direction. I really didn't think it was about Micheal Carter either. This podcast you referenced generates completely different numerical data than the websites everyone else reads leading up to the draft. Furthermore, their rejection of the standard every other draft website is using can then be applied to all the agility drills, complicating data for the entire draft. If you don't know why that led to a lot of confusion, good luck to you.
Other drills at the Combine don't use the same technology the forty uses to clock the start time from the moment the player begins to move, and thus do not require adjustment. I assume there's a reason for this, but I couldn't tell you what it is.
Furthermore, it's not just a podcast. Player Profiler is a web platform used by most of the best analysts in the fantasy football community, and the podcast regularly hosts those analysts, who agree with their methodology in this regard. It's been discussed dozens of times on various podcasts under the Rotounderworld umbrella with various analysts who are employed by other sites. I'd wager more than a few NFL front office people use it as well, as it's very easy to use and presents you with an abundance of information in a clean, easy to read format.
As I said in my previous reply, if we were simply taking this year in a vacuum, then sure, the average variance between Combine and pro day times really doesn't matter, as we're only comparing 2021 prospects with each other. But if you want to compare these prospects from a historical context to try to find their best comparable players in an attempt to project their NFL careers, then you need to properly adjust for the fact that there was no Combine this year, and so average forty times will be slightly faster.
ETA: I guess technically the site also has athletic metrics for non-skill position players (I just looked up Myles Garrett, for example, who ironically has Clowney as his best comparable player), but there's far more production data for the skill guys available.