According to Florida's records, Trump voted a normal mail-in ballot sent to Mar-a-Lago, not an absentee ballot sent to the White House. Indeed, someone had to deliver it from Mar-a-Lago to the White House for him to vote it, which would be...wait for it...ballot harvesting https://twitter.com/realDonaldTrump/status/1248031484532928514

But understand, this vote fraud rhetoric isn't really an objection to mail balloting, it is intended to set the stage for onerous provisions designed to suppress votes