The “screen” effect doesn’t exist. But the percentage of students enrolled in cs programs grew a lot of the last few years, and I’ve seen the passion difference have an effect. Two friends of mine graduated last year. Both had zero offers out of undergrad (this is the norm right now, again, completely irrelevant to screen time). One of them was passionate about coding and kept working on side projects/leetcoding, eventually landing a role at a tech company after a year of working at a boba shop. The other, who struggled with coding and was verbally not passionate about it (complained about it a lot, didn’t interview prep much) ended up throwing in the towel a few months on the job hunt.
An anecdote, but probably generalizable across those in today’s job market. But the market is the core problem, second to the individual’s willingness to grind. Neither are related to screen time.