He would have been in jail by for that amount.
I have read some horrific charges in child support and divorce papers. The wording is such as to get a response out of the other party. The vast majority of claims are proven false in a hearing.
Basically, you can say anything in a civil document accusing the other party and don’t have to defend it until it goes to a hearing or trial.
Bascially, I wouldn’t give this claim by the ex a moments thought until after the hearing/trial.