Apple's Ios Jailbroken Via Bootrom Based Exploit

https://medium.com/@x5jomux002/how-to-get-more-results-out-of-your-jailbreak-ios-12-45d6b605a89e

The process takes approximately five minutes from start to finish. I did not try yet, but the untether might be a cydia package if it's feasible. The question is?