Excerpt from Google’s blog post:
Today we see an even greater opportunity to make Pixel smartphones available to more people in India, and are very excited to announce our plan to manufacture Pixel smartphones in India. We intend to start with the Pixel 8, and will partner with international and domestic manufacturers to produce Pixel smartphones locally. We expect these devices to start to roll out in 2024, joining India’s “Make in India” initiative.
I think it’s just a move to diversify their supply chain, reduce the China risk (for example in case of a new Covid lockdown in China) and probably make the phones a bit cheaper for the Indian market.