As max would say - Fake news.
After seeing your post, I invested over four hours playing on my iPhone and iPad (two separate accounts - Legendary rank since people are dumb enough to think being high rank gets you banned) and in the past 4 hours I’ve played over 10 ranked games, as well as the Terminal playlist and FFA. Not banned, not detected. Using Liberty Lite (Beta) and A-Bypass on the iPad (13.3.1) and Choicy, Kern Bypass and Liberty Lite Beta on the iPhone. Neither are banned, over 30 games alone on both accounts today.
For those who get banned realize —
Rank does not matter - at all. You won’t get banned for being a higher rank, the only reason you get banned more at higher ranks is because higher ranked players watch killcams and can tell if you’re hacking and over time you rack up reports and then you get banned. It’s not because you’re Legendary, it’s because you’re not hiding it well enough to play at Legendary - aka, get good.
In short: It is NOT detected. You got banned either due to your jailbreak bypass, or due to your account being reported a lot over time.
To test if your jailbreak is detected (you should always do this) simply remove the hack from your phone by uninstalling in Cydia. Then launch the game and play with a guest account - get through the tutorial and grind some games. If you don’t get banned your jailbreak isn’t detected. If you do it’s detected. The hack itself as of September 19th, 2020 isn’t detected.