I'll give you blocks, but not steals as an indicator of good defense. I think you really need to watch the games and see how those stats are ac ulated because looking at a piece of paper with steal and block stats don't always tell the story of it being good defense.
Steals for example, a player can be an average defender and still rack up steals if they're constantly leaving their man to try and get a steal in the passing lane. Similar thing with blocks. The downside of both these types of defensive play is that you can get burned and your primary defensive assignment can get an easy bucket out of it if your gamble doesn't pay off.
For blocks, someone like Serge Ibaka is a good example. This guy gets a lot of blocks (especially weakside blocks), but he's not the best one on one defender in the NBA. You can still score on him if you're a good offensive player. He's on the extreme end of the scale though as his blocks and shot alterations can/do make a difference is games defensively. Kyle Anderson is nowhere near that level with a few steals and a couple of blocks.