About App Icon Link on Reminders app
GoodTask uses and shares default Apple's Reminders app's data. There is an app icon link on default Reminders app (like above screenshot) if you make a reminder via Siri or Share button on Safari or other few apps. This link data is locked on Apple's Reminders app only and is not accessible through GoodTask.
You can go directly to Reminders app from GoodTask (Settings - Advanced - Show Reminders button) to use this feature quickly. (CMD-R for keyboard shortcuts on iPad)
I've requested Apple to give access to this data but it hasn't gone through yet. When it does, it'll be supported asap. Thanks!