I believe you are right. I too never believed the uniparty stuff - thought it was crazy - until this election cycle. The Republican party is so divided that it is almost two parties. The establishment wing is more in line with the Democrats than conservatives.
BTW, Doug Heye is violently Never Trump. He famously called Trump “an abortion on the GOP” very early in the primaries on CNN. This article is a classic example of the media using a Trump hater to project their anti-Trump agenda.