Makes interesting reading. I don't claim to know what's true or not. I haven't and won't be installing Catalina and so far I've deleted the iOS 13 update every time it's shown up on my phone.
I did hack up an applescript that would pull Reminders out and insert them into Todoist (my alternative to GoodTask). It is here: https://github.com/posguy99/AppleScript/tree/master/Todoist