@AgentKuga
Kind of. Ibis knew it would be an obvious and lousy screen and that Aya knew it would be an obvious and lousy screen, but also bet that Aya would still try to work past/around Tsubame and not guard her left side. Which is why Aya says "I won't be caught in your screen" then "Argh, there's no way they wouldn't use a limp screen". Basically, Ibis knew she'd be cocky and so used that against her for a feint.
ETA: Should also mention why real screens are used: it means either the opposition has to swap defenders for a mismatch (Aya on Tsubame and Sierra on Ibis), or Sierra leaves Ibis open, or Aya works past the screen, while Sierra moves up to defend Ibis at the same time, leaving Tsubame open. It's why the TL mentions they get used a lot. Especially in pro basketball that uses a lot less 1-on-1 defense, it can make holes in the defense from being out of position, or free up an uncontested 3-pointer for the person with the ball.