I didn't see that, but I'm sure in the haste and confusion of the final hours lots of things changed. This is the federal register quote I saw:
This is Section 2. SEC. 2. Equal treatment of silencers and firearms.
(a) In general.—Section 5845(a) of the Internal Revenue Code of 1986 is amended by striking “(7) any silencer” and all that follows through “; and (8)” and inserting “and (7)”.
This is 5845 (a)
§5845. Definitions
For the purpose of this chapter-
(a) Firearm
The term "firearm" means (1) a shotgun having a barrel or barrels of less than 18 inches in length; (2) a weapon made from a shotgun if such weapon as modified has an overall length of less than 26 inches or a barrel or barrels of less than 18 inches in length; (3) a rifle having a barrel or barrels of less than 16 inches in length; (4) a weapon made from a rifle if such weapon as modified has an overall length of less than 26 inches or a barrel or barrels of less than 16 inches in length; (5) any other weapon, as defined in subsection (e); (6) a machinegun; (7)any silencer (as defined in section 921 of title 18, United States Code); and (8) a destructive device. The term "firearm" shall not include an antique firearm or any device (other than a machinegun or destructive device) which, although designed as a weapon, the Secretary finds by reason of the date of its manufacture, value, design, and other characteristics is primarily a collector's item and is not likely to be used as a weapon.