You can have a scoreboard objective criteria like minecraft.used:minecraft.dirt or minecraft.used:minecraft.cyan_banner.
Currently you cannot have minecraft.used:minecraft.#buttons or minecraft.used:minecraft#buttons.
Is this intended? I feel that it is not, as we can use the new 1.13 tags in other detection commands. If this is fixed, it would be extremely useful to map makers!
Stats don't use tags.