This is flatly false. The HV operating procedures on cars add significant complexity and danger to working on them. In fact, any HV work will automatically add a huge chunk of labor hours to any work and is why anything touching the HV system instantly goes into the thousands of dollars as a baseline. We are talking hundreds of volts above fatal baseline and very high amps on accidental discharge. For comparison, its safer on your biology to stick a fork in 120VAC outlet deliberately than to make a mistake with HVDC.