It refers to the manufacturer's holding a monopoly on repairs to their cars. In jurisdictions with "right to repair" laws the manufacturer can't “punish” owners by voiding warranties in response to third party repairs. Further, the manufacturer cannot refuse to sell parts for repairs as long as they have the parts for their own use. In Massachusetts, Tesla also has to provide the service manuals needed to accomplish repairs. Of course, they are not required to provide this stuff free, and Tesla's charge for service manuals put them out of reach for private owners (well, at least for this private owner!)