You're getting entangled in the details. It's clear from his tweets that what he means is that mail-in ballots will cause a rigged election. We shouldn't trust rigged elections, so he's saying that if the election includes mail-in ballots, it will be untrustworthy.
In order to make that reasoning (you could say that arguments are not false or true, they're just arguments) he's using false (CA will not be sending ballots to "anyone") and unsubstantiated (mail-in ballots have been working for years without extended robberies and forging, why would this be any different?) claims.
You can search and reason about the words so that "technically" he isn't lying. But the actual message he's sending is very, very clear.
In order to make that reasoning (you could say that arguments are not false or true, they're just arguments) he's using false (CA will not be sending ballots to "anyone") and unsubstantiated (mail-in ballots have been working for years without extended robberies and forging, why would this be any different?) claims.
You can search and reason about the words so that "technically" he isn't lying. But the actual message he's sending is very, very clear.