If someone is a software developer who has done non-trivial things and linear algebra but not recently and needs to be refreshed, do you provide time/training to refresh on the math skills?
Normally that kind of requirement leads to _higher_ compensation
I'd rather spend my time focusing on applying at other positions that will pay just as much if not more without being required to spend nights and weekends relearning a skill that is just not used very much elsewhere and not requiring security clearances, and why would I waste my time applying there when other jobs that do require these skills compensate more for the effort.
On the other hand if this company did pay closer to Meta salaries (the comparison they used) then it gives all candidates, including US citizens who fit more of their eligibility criteria, that much more incentive to actually relearn these skills and makes the expected return on investment potentially worth it.