Can I use Romex in an unfinished basement or attic?
You're referencing the wrong code section.
Nonmetallic-Sheathed Cable
Romex is covered by article 334 Nonmetallic-Sheathed Cable: Types NM, NMC, and NMS.

Nonmetallic Extensions
Article 382 covers a cable known as FlatWire, or Concealable Nonmetallic Extension (CNE) cable.

Notice that this cable has a single insulation layer over the conductors. Whereas NM cable has insulation on the conductors, and an outer insulated sheath.