Did he lie? He lied about the sandpaper but I'd be willing to bet if he didn't come out in a press conference and admit to ball tampering this would have disappeared overnight.
If anything he was punished for being too honest.
Further, CA's investigation found that it was Smith who directed "that evidence of attempted tampering be concealed on the field of play". In other words, Smith told Bancroft to hide the sandpaper in his trousers.
Smith was also found to have "misled match officials and others regarding Bancroft's attempts to artificially alter the condition of the ball" and "misleading public comments regarding the nature, extent and participants of the plan".
CA slaps bans on tampering trio | cricket.com.au
Steve Smith, David Warner banned for one year, Cameron Bancroft to serve nine months out
www.cricket.com.au