"That experience" properly refers to his "ever [having] participated in a lawsuit" in which he failed to disclose the whole truth, as he promised to. It's pretty strange to leave out the case that cost you your house. His failure to disclose a relevant case when questioned by the judge is inexplicable.

He also claimed during voire dire that he would set aside his understanding of the law from any past cases. Then he gave media interviews in which he talked about using his past, incorrect knowledge, told interviewers about doing things that were contrary to the court's instructions, and explained how he turned around the jury's verdict.

Oh, and he also claimed that the court only asked him about 10 years back to one interviewer: a claim that has proven to be inaccurate both due to that not having been said and due to another juror remembering a case older than that.