Where on the my vote portal does it let you cancel? Ballots have already been mailed anyways so it's a bit late for anyone to try to change anyones status.
I've nothing to gain spreading misinformation. As I've said I've hidden the thread until a reputable news org is able to report on this.
To request a replacement ballot you have to fill out a form and send it to your county clerk, and the form asks you for a lot more info than your DOB.
As far as cancelling your vote, when has that EVER been an option and what purpose would it serve?