There is considerable amount of debate over the truth of that statement, esp. on the matter of what exactly folks mean by “premillennial.” It is a “truth” often taken without critical examination by modern premils.
I agree that there is debate over these very issues...which is why people making it an issue of faith are so wrong. Good and decent educated scholars disagree in this area...so for people to insist that those who disagree with them are essentially idiots is at best mean spirited and at worst damaging to the cause of Christianity.
My issue as I’ve stated is that people ridicule those who disagree with them on non-fundamental doctrines. This is wrong and I will call anyone out on it. Christian brothers can agree to disagree on such issues, but the minute we start diminishing the faith of people because they may hold a particular non-fundamental viewpoint...well we’ve ceased to project the glory and love of Christ. I find Mr. Mitchell shameful...not because I disagree with his position, I find him shameful because he takes so much pleasure in lampooning people who have honest differences of opinion regarding the end-times. My interpretation is that this video was not made to advance the Kingdom of God...it was made to advance the cause of Mr. Mitchell.