Yes, I would hope medical staffs do not lie. I would also hope that false data isn't being submitted with these "taped pro days", but I can see where some of the numbers would be very hard to trust. Also, aren't some of the timing mechanisms used at pro days a lot less accurate? Handheld stop watches vs electronic laser timing of the start and finish at the combine?
Yes, much less accurate.
A couple things go on with pro days.
One is that players are in their comfort zone. The combine is a pretty grueling process and they don't get to decide when to do anything once they're there. At a pro day, you can get yourself feeling exactly right leading up to the moment when you run or do whatever.
Another is that the means of timing are less accurate. A hand timed 4.22 could be a 4.35 at the combine. Human error is real and the margins here are tiny.
A third is that guys have their combine to use as a self-assessment. Maybe they added weight because they wanted to be listed bigger, but didn't run as well. Well now they can drop the weight. Maybe they did the agility drills at 7:00 after a bunch of other drills and they sucked. Well now they can schedule them at a better time.
And then specifically for these taped pro days, guys can film themselves doing a drill 15 times and then send out the best one. Maybe a guy is super hit and miss with his starts in the forty, and it's the difference of .05. So you keeps trying until he nails the start and then sends out the one 4.45 to teams out of a batch that are all 4.50 and up.
Ultimately you just have to check it against the tape.
The reason Danztler's 4.38 catches my eye is because he's not slow on film. I don't believe 4.38 for a second, but the film also says that 4.64 isn't quite right either. And if the reality is in between, he's a very interesting prospect.
The reason why Reagor's workout isn't just something I write off entirely (though I do dismiss 4.22) is because he is crazy fast on tape, and he gained weight for the combine. He went back down 10 lbs for the pro day. And his agilities made no sense against his COD skills in games. So I don't buy a 3.97 SS necessarily, but I do believe he has high end results there.