What he's doing is perfectly legal and most people don't read the whole section.

(1) Subsection (a) of this section does not apply to a removal, obliteration, tampering, or alteration by a person specified in paragraph (2) of this subsection (unless such person knows that the vehicle or part involved is stolen).
(2) The persons referred to in paragraph (1) of this subsection are—
(A) a motor vehicle scrap processor or a motor vehicle demolisher who complies with applicable State law with respect to such vehicle or part;
(B) a person who repairs such vehicle or part, if the removal, obliteration, tampering, or alteration is reasonably necessary for the repair;
(C) a person who restores or replaces an identification number for such vehicle or part in accordance with applicable State law; and
(D) a person who removes, obliterates, tampers with, or alters a decal or device affixed to a motor vehicle pursuant to the Motor Vehicle Theft Prevention Act, if that person is the owner of the motor vehicle, or is authorized to remove, obliterate, tamper with or alter the decal or device by—
(i) the owner or his authorized agent;
(ii) applicable State or local law; or
(iii) regulations promulgated by the Attorney General to implement the Motor Vehicle Theft Prevention Act.