Confusion on Threshold when using PowerApps form in SharePoint

Hello

We are in migration process, migrating data from SP2016 to SPO. For most of the list we planned to create PowerApps forms. This proposed forms are medium complex forms. Recently I saw some of the articles that if any SharePoint list have more than 5000 items, The Power Apps will immediately break if already published and will not allow you to publish or save it. All submissions will break. 

Is this really true or some confusion in my understanding?

Regards

Avian