Hi this only gives gold SPG Status. However you cannot transfer your points over to SPG and hence convert your points to SPG Points??
The status is a bonus, the fact they are a points transfer partner is what you are looking for, mind you the card also comes with some nice airport lounge access privileges:
Starwood Preferred Guest
The Starwood Preferred Guest®(SPG®) program provides remarkable access to over 1,000 hotels and resorts in nearly 100 countries across nine hotel brands. These include Sheraton®, Westin®, W®, Le Méridien®, The Luxury Collection®, St. Regis®, Four Points® by Sheraton, Aloft SM and Element SM. SPG members can redeem Starpoints® for free award nights and for award flights on over 350 airlines - both with no blackout dates.
Sign up for SPG and transfer your Diners Club Reward points to earn Starpoints. Transfers must be in blocks of 3,000 Diners Club Reward points as specified by Diners Club. Reward points may only be redeemed for Starpoints by the Primary Cardholder to their SPG account. Points once redeemed cannot be reversed.
2 Diners Club Reward points = 1 Starpoint
SPG terms and conditions apply, for complete terms, visit SPG.com