How can record-level permissions be "overridden" in 8.3.4?

Does anyone know how this feature released in 8.3.4 can be used?

https://academy.creatio.com/docs/8.x/resources/release-notes/8-3-4-twin-release-notes#title-advanced-customization

I do not currently see any additional options in the object permissions section when compared against 8.3.3 for putting in place custom record-level access rights, and can't see any new documentation around it in the academy.