Does the timing chain really needs to be replaced?

Depending on mileage and if you hear a rattling noise on cold starts you may not have a timing chain issue. I would recommend logging the cam sensor data to determine if the timing is off. I had a similar situation caused by a intermittent connection at the ECM cause cam codes and limp mode on acceleration. Timing chains are very expensive so I recommend spending time confirming it with proper diagnostics. The trick is finding someone with the knowledge and experience to do it.