dont get it, get mse instead

Your level of impaction does seem quite high on the bottom(wisdom teeth are going straight into the molars), but jumping straight to removing 6 teeth is a lot. 

Are you in pain, how did you end up at the dentist in the first place?

I don't think mewing alone or any non-invasive method is going to get you a large enough result yet to make the situation in your lower jaw much better. But it's also good to get second opinions that focus on preserving teeth - amputations can have bad after effects.

I would seek an expansion-focused dentist for a second opinon (there's more and more in India now) and also ask your existing dentist if it's really necessary. Goes back to the question of why you're at the dentist in the first place, because of pain or braces or just happened to go?