@cicerone imposter,
Sure, it is evidence, very important evidence, regarding his credibility.
But technically, he's not a witness in this case. I don't believe that any of those past statements of his were given under oath, and they weren't really depositions. But those past statements are still evidence of where he has apparently lied, or been inconsistent or contradictory.
His credibility will be a major issue for the jury.
I really wish the jury could know about the lying to the court, and his own lawyer, about his assets, so he could get a lower bail--that was brazen lying that involved a rather elaborate scheme. The man is a liar.