Can the other party still see the deleted SMS?

Yes I sent a short message myself, and the other party saw it before deleting it, so even if it is deleted, the other party can still see the short message in the sent short message, and some mobile phones will automatically back it up when they receive it, so even if it is deleted, the other party can still see it in the backup file, so even if it is deleted, the other party can still see it.