Looks convincing on the surface, but the real tell is point spread. Don't just take the championship years, go back and look at all the years they didn't win and then you will get a better idea how the stats indicate successes. They didn't win 4 in a row, so what of those in between seasons?
In 2002, for example, the Spurs allowed just above 90 points a game. They didn't win the championship.
In fact, there are a number of years that the Spurs had great defense and didn't win the championship.
The problem now is that we don't have defenders, not that we don't have defense. It's also that we don't have a real low post presence, so we cannot really slow the game down except to move the ball around the circle and maybe get it inside from time to time. We play faster now. That's going to mean more points. If we had a young Tim Duncan and a healthy David Robinson, we could get back to those low numbers, but we don't. We don't have a "more defense" button.