Hi Atul,
Yes, I remember you well! I hope you having been doing well. It's definitely good to interact with you again!
In terms of validating the SAMLP Request, yes, you would typically want to have some additional policy to do the validation to check for proper signing and any restrictions. The example I provided omits that just to show the basic flow. You would want to add the Process SAML Authentication Request assertion and perhaps do some additional checking to ensure you are receiving a proper and legitimate SAML request.
Thanks,
Greg