The offer: the company does not get a rupee
Start with the structure, because it reframes everything else. This is a pure Offer for Sale of up to 203,709,239 equity shares of ₹1 face value. State Bank of India is selling up to 128,334,397 shares. Amundi India Holding is selling up to 75,374,842.
The Red Herring Prospectus states it plainly on page 118: "Our Company will not receive the Offer Proceeds and all the Offer Proceeds will be received by the Promoter Selling Shareholders."