Yes he did, under oath, and he didn't do so well - he was caught lying about evidence during his testimony, and famously admitted that he knew that the shooting wasn't staged.
In Lafferty et. al. v. Jones, Jones was ordered to be deposed under oath in March 2019, as part of the trial. This was the deposition in which he admitted the deaths were real. It wasn't until 2021 where the judge in that case found him liable by default.
