(And yes, today's WinForms and XAML editors in Visual Studio are quite "RAD", and exactly as "RAD" as VB <= 6 was, if not more so. VB.NET was never less "RAD" than VB <= 6 from the standpoint of visual tools. It just shifted component/plugin ecosystems and left an impression that it was less "rapid" to develop with because of sharp new learning curve, but the "rapid" never meant "no learning curves", it meant WYSIWYG designers, which VB.NET still had in spades.)
Those that only offer formulas with no escape route to traditional programming, as you describe, are more commonly considered "no-code".
This distinction from wikipedia is pretty accurate:
"No-code platforms are accessible to any end-business user while low-code platforms require professional developers who can work within the platform's constraints."