The title is misleading, but the quote is direct from Trump's official website, in it's entirety.
Statement by Donald J. Trump, 45th President of the United States of America
If we don’t solve the Presidential Election Fraud of 2020 (which we have thoroughly and conclusively documented), Republicans will not be voting in ‘22 or ‘24. It is the single most important thing for Republicans to do.I reads like a veiled threat to republicans to quit blocking fraud investigations and get onboard.
Trump isn't that hard to understand. You just have to want to.
I believe you misunderstand the last sentence. He is saying that Republicans MUST get out and vote- he’s not threatening anybody, that Republicans will stay home if they think that there is no hope.