I assume they are mostly unrelated skills, my mental assumptions work something like:
Suppose the top 10% of developers break down: 1/3 are noticeably worse than average and take 6 months to find a job, 1/3 are average and take 3 months to find a job, and 1/3 are above average and take 1 month to find a job. Each month 3000 people or 100 good 100 average and 100 bad start looking for work and the number of people looking for a dev job is 10,000.
Our of that 10,000: 100 are great developers skilled at finding jobs so 1%. 300 are great developers that are average at finding jobs so 3%. And 600 are great developers that are bad at finding jobs so 6%. That’s still 10% of applicants but most of them don’t look as hot in interviews.