Whenever I see these posts I immediate translate them in my head to "we're in the middle of a talent shortage at a price I am willing to pay." I've worked with very large amounts of data and high performance computing for most of my career; I mostly had finance related jobs in the last decade or so. I have most of the skill you want, including some you don't know you want. However when salary comes up, that is where…
Thought experiment: If 100 companies had openings for a skill set that only one person could deliver, all 100 companies could eventually fill their openings by sequentially outbidding each other for the services of that one person.
So how would we know if a talent shortage really exists for a certain job? I can think of a couple potential hints: if starting salaries are going up much faster than the national average, or if the unemployment rate for that job is much lower than the national unemployment rate. Either would seem to indicate that, relative to the job market as a whole, there was a greater demand than supply for that particular job.