That is true. Delta is simply adding seats and replacing smaller aircraft with larger ones out of SLC. My opinion and what I am looking at is down the road in about 15 years or so. Obviously Delta isn't going to dehub within the next 1-12 years (the time between now and when the new terminal will be built). I believe Delta would not make that big of a commitment to an airport to only drastically downsize it or dehub it. I am sure they have, and are still learning that lesson, thanks to Cincinnati.
If you look at the history of the US aviation industry, mergers and buyouts happen every 15-20 years between the major airlines. I personally think that around 2030, the US will have even less airlines. By that time Delta could have a full on hub in Seattle thanks to Alaska Airlines or by their own personal growth. SLC, SEA, and DEN are going to see major changes when it comes to hub status and what airlines actually call those airports hubs.
I am not calling anyone a liar. Duh.