The problem is that requiring IQ tests for employment introduces liability that employers do not want.
Neither IQ nor SAT scores correlate with job performance. SAT scores were requested at Google for years. Explicit aptitude tests have been used in the past, and continue to be used. They are quite legal, as long as they are used for their intend use.
https://www.forbes.com/sites/theemploymentbeat/2014/03/07/em...
https://www.shrm.org/resourcesandtools/tools-and-samples/too...
https://www.businessinsider.com/why-your-iq-strongly-influen...
SAT is an IQ test:
https://www.nytimes.com/roomfordebate/2011/12/04/why-should-...
The TL;DNR: Nuh-uh!
https://www.nytimes.com/roomfordebate/2011/12/04/why-should-...
In the future, you really shouldn't link to dueling articles in an opinion section. It makes this all too easy.