From everything I've read, they expect the players to hit baseline numbers based on their position and then they apply that information to the film. What makes it interesting is that the combine does more for players who might move positions in the NFL which makes JoJo Domann a really interesting person this year.
A couple of good examples from Nebraska would be
Lamar Jackson and
Nate Gerry.
Lamar Jackson's physical profile for cornerback wasn't the best but he did have very good profile for a
safety. However, when you watch his film, you see that he was not comfortable playing in zone and is very late breaking on guys who enter his zone. His below average speed at CB mixed with the fact that he could only play CB made him go undrafted despite being "better" in college than some guys that got drafted.
Gerry might have below average athleticism for a safety in the NFL but really fits the profile for a modern
off ball linebacker. When you look at his film at Nebraska, we saw a guy that is comfortable coming up and making a play in run coverage, understands the zone he covers, and is very physical. So his film and combine suggested he could be a contributor at a different position.