The whole point of the license key wizard page that this article has removed was to gain a free license for a hybrid server for those stuck on Exchange 2003 or Exchange 2007 to install a hybrid only mode Exchange 2012 or 2016 server and allow the move of accounts across to Office 365. Why would we go out and pay a fortune for a new exchange server license then pay again for Office 365? You seem to be abandoning your older customers with this move - or maybe as your post above shows, whoever replaced the wizard with this page didn't actually read the source pages like this that show why it was provided in the first place. Either way, removing it with no notice at all before the replacement is ready is incredibly unfair and I hope they manager or director views how they are treating their customers in public with a very dim view.
Where can I send the bill for my wasted Sunday in the office after this was removed with no way to perform the planned work, no way for your support staff to generate the keys and just a 'wait until 7th August' message on the replacement page? Had there been notice I'd have got the key last weekend in preparation, I just didn't want to start the Office 365 Enterprise subscription until I was ready to use it, and ended up wasting most of the day going back and forth to Microsoft Support who tried their best to support but ended up being unable to help due to the same daft early replacement of the wizard.
https://support.microsoft.com/en-gb/help/2939261/how-to-obtain-an-exchange-hybrid-edition-product-key-for-your-on-premi