No! If you wait until election day to vote you may not be able to because someone else has voted in your name. If you just mail it in it may get lost or discarded. That’s why Trump is saying to do both.
Yes, make them scour the registry to see if you have voted more than once. In so doing they will need to scour everyone. That is exactly what we want them to do.
It also lets them know that if they throw our ballots in the trash, we will notice.
Genius, classic Alinsky/Cloward-Piven. Make your enemy live up to their own rules, overwhelm the system. We’ve got this!