I'm having the same problem too, it has the exact same message.
Also, if you look in the small print on the bottom, it mentions "This Google One membership offer (“Offer”) provides you with subscription benefits at no charge for a period of 6 months from the day you redeem the Offer (the “Offer Period”). "
This contradicts the original message: "So, here’s 3 months of Google One, on us.".
I think the people in Marketing (?) who pushed this out made a few mistakes...l