Seems to me that this was a job put together with a specific person in mind and somehow that didn't work out and they just didn't know what to do after that. Seen this same scenario play out before at multiple companies.
This is most likely the reason. One of the requirements for an H2B visa is that an in-country hire isn't possible. And you make that impossible by asking for impossible requirements. You may have seen these as experience requirements in 5+ years technology that has only existed for 2-3 years.
I think h1b doesn’t have such requirement - only that the wage is in prevailing range...
applying to employer sponsors green card though does require proof of lack of local hires, and job reqs that are created to prove this often go to this crazy level and have to be met 100%.
