That solution didn’t work for me, I have created the other one. The Mass Delete is implemented using List of items + Countdown timer + Delete action. In brief: you need to create a specific “delete” screen, where you have the list of items in the collection to be deleted, together with timer. When timer finishes, the list item is deleted. It is also possible to implement deleting records from 1:many collections (1 parent item + child items).
Here is the video: Adalo experiments - mass delete - YouTube
Tagging @Leo and @TORCH as well, might be interesting for them.