I agree with you. AC 20-27G and Order 8130-2F clearly state the use of salvaged assemblies from type-certified aircraft is permissable. For those interested here's the exact wording out of 20-27G:
d. Use of Salvaged Assemblies from Type-Certificated Aircraft.
The use of used or salvaged assemblies (for example, landing gear, horizontal stabilizer, and engine mount) from type-certificated aircraft is permitted, as long as they are in a condition for safe operation. However— Note: The definition of fabrication is to perform work on any material, part, or component, such as layout, bending, countersinking, straightening, cutting, sewing, gluing/bonding, layup, forming, shaping, trimming, drilling, deburring, machining, applying protective coatings, surface preparation and priming, riveting, welding, or heat treating, and transforming the material, part, or component toward or into its finished state.
(1) You should contact your local FAA MIDO or FSDO prior to using a major assembly or subassembly, such as wings, fuselage, or tail assembly from a type-certificated aircraft. As an amateur builder, you should be aware that when building your aircraft, the excessive use of major assemblies or subassemblies from type-certificated aircraft would most likely render it ineligible for certification under § 21.191(g).
(2) You will not receive credit for work done on, or the use of, salvaged major assemblies or subassemblies when determining whether your amateur-built aircraft has met the major portion requirement. This would include any "rebuilding" or "alteration" activities to return these components to an airworthy condition.
(3) All fabrication, installation, and assembly tasks on the Amateur-Built Aircraft Fabrication and Assembly Checklist (2009) that you’ve completed by the use of used or salvaged assemblies can only be annotated in the "Mfr Kit/Part/Component" column.