The only interesting bit to me was the Delta exec specifically mentioning right near the end of the article that they designed the facility with SSTs in mind.
The Concorde couldn’t keep up economically, but it’s also a 40 year old design.
BA 001 is a great example of this concept. It’s a flight designed entirely to save business travelers from going to Heathrow. London City to JFK with a fuel stop and pre-clearance in Ireland. Business class only.