Ah, an ad for a phone the average person can't buy. No seriously, I tried to find a way to buy it and it looks like the only way to do it is contact Samsung's sales on behalf of a company. Why bother posting this here if it's about a phone that's completely out of reach for basically everyone not in the military?
If I had to guess, they died out in the consumer market when a lot of their unique features got baked into normal phones (water resistance, etc). A thick case and a heavy duty screen protector could get you the rest of the way which is probably good enough for 95% of their consumer sales.
My friend (HVAC technician) loved his S6 Active but is getting by fine with his S21+protection accessories
Xcover, sure, but not the Tactical Edition, right? These phones have extra radio hardware to support connections to things like night vision googles etc.