I'm pretty sure a guy with 4 stars plus labeled "dual threat" can pass extremely well. All of the 2020 recruits I glanced at had over 3,000 yards, often over 2-3 years.
The "pro style" seems to refer to a tall guy who is less mobile but can throw it 70 yards on the back foot. Both types likely will be effective in college. The "pro style" guy probably should avoid going to schools that run the option most of the time though.
I'm musing about Fields versus Jacob Eason. Both have strong arms, Fields is a bit more mobile (but not really fast). Eason was a gun slinger in HS and his first year in college, he's rarely going to run. Fields was used as mostly a runner but clearly could pass well. Fields was 220 pounds in HS, he got used to running over people.