Perhaps this is the hardware people are speculating about with magnetic switches? https://www.ifixit.com/News/33952/apple-put-a-hinge-sensor-in-the-16-macbook-

Perhaps this is the hardware people are speculating about with magnetic switches? https://www.ifixit.com/News/33952/apple-put-a-hinge-sensor-in-the-16-macbook-pro-what-could-it-be-for https://www.ifixit.com/News/33952/apple-put-a-hinge-sensor-i... Though it seems their "hardware only" solution was on earlier models than that, so maybe not.