No, a chop chop receives the stolen cars (acting as an accomplice of the thief), disassembles them, and then sells the parts.
That part in parentheses is important: if the shop simply bought cars from whoever brought them in and then parted them out, that's a legitimate business.
Of course, cars are a little bit of a bad example because transferring ownership requires registering the title and whatnot. Let's talk about cellphones instead, since they don't: are those automated kiosks in the mall that let you trade in old cellphones illegal? After all, somebody could steal a cellphone and then turn it in at the kiosk. Does that make the kiosk owner a huge criminal?