I've read dozens of definitions of confined space. The sort of bedroom with enough square footage to have a wood stove, clearances, and room for regular bedrooms furnishings does not qualify. You'd have to put a sill across the doorway, glue the windows shut, and seal off the ventilation system for it to qualify as a confined space.
A ventilated room with windows and a doorway that anyone can easily walk in and out of is not a confined space.
Yea, and they realized they were making them too tight and so now there are codes that enforce the installation of fresh air inlets, which can be fitted with HRV/ERV's optionally in most areas, required in some areas/situations. "Too tight" is against code now. Furthermore, if you're arguing that homes are "too tight of construction" for a wood stove in a bedroom, then you're simultaneously arguing that they are too tight for a wood stove to be installed anywhere, as almost all modern homes have regular ventilation ducts in every bedroom. In this house, every bedroom has multiple supply ducts and a return duct. When the door is shut there's still huge holes leading to huge ducts that connect the room to the airspace of the rest of the house.
You can't have this both ways. If a wood stove can't go in a bedroom for the reasons you're citing here, then you better remove the wood stove from your house or drop this pointless argument.
Where does that code say that an air supply solution can't be used to satisfy the requirement of "not unusually tight?" Why does it have to call it out? It doesn't say "unusually tight constructions must be kept that way" either.
It honestly doesn't need to, because if you're installing a wood stove in a house in a "to code" way, and then configuring the home to ventilate in a "to code" way, then the stove will have access to adequate air if it is burning air from within the home, and even more-so if installed with an outside air kit.