The same article gets written about every high profile newly drafted QB to convey a message from the team to the QB that no matter what kind of offense was run in college the pro game is at a completely different level "more sophisticated" so the process of learning the trade has really just begun.
The folks who do analytics on prospective pro QBs always complain about college teams using the shotgun to spread out Ds to create mismatches that don't happen with pros covering pros Other issues for them are that pro offenses use step drops (like 7 step drop) and timing patterns. The drop concept means a QB has to get the footwork correct and the initial read as they will have their back to the D after the snap - to be effective on every play this has to become second nature by film analysis, experience and lots of reps. Pros can build an O around timing patterns on the premise that receivers will execute with precision. Unlike a college coach who wants to do this pro teams generally speaking don't have to develop receivers and then start over as "forced retirement" annual wipes out their most most experienced players. Besides all this think the nature of the games is different - in college game plans focus on mismatches whereas the pro game is more about constant adjustments which makes ever improving knowledge and skills beyond a decent performance level critical (sort of a "life time learner").