It has no errors, it doesn't cause lag, there is not a single reason why it should get fail-binned. The Ion-cannon causes lag because it fake-kills basically every brick in a very big area, which was the reason why it got failed (I think, not sure if it caused any errors, too).
The only reason why the Ion Cannon was put into the CRC list was becuase it made errors.
Failbinned on the other hadn, horrible quality model, bix explosion.