This DEAL might be for New customers only. It is more than likely put on by Adobe through WD if you buy a WD External drive. I believe if you bought that same drive without the LR/PS 2 month deal it would cost the same. that is why I say Adobe is sponsoring it, with the help of WD.
You should read the Fine Print. Here it is.
* Two-month membership to Adobe Creative Photography plan is redeemable during product registration. Internet connection and Adobe ID required. Available in all countries where the Adobe Creative Cloud is available. Offer limited to 1 per new Adobe user account. Offer must be redeemed by July 31, 2020 while activation code supplies lasts. WD reserves the right to change or discontinue this offer at any time without notice. See https://www.adobe.com/legal.html
So what that mean is IF you are a New user of Adobe, a New Adobe ID or an Adobe ID that does not current subscribe to any plan , and subscribe to a 1 year Photography plan subscription you get either 14 months subscription period, only making 12 payments, or you get the last 2 months of the 1 year subscription without having to pay for it.
Adobe is looking for New users. Not giving away 2 free months to current subscribers with the purcahse of a WD external drive.