Wasn't national review a major never- Trumper establishment news thing?
No.
They were against Trump in the 2016 Primary for a wide variety of reasons from ideological (look, Trump was a GAMBLE with no real Conservative bonafides in 2016, National Review much would have preferred Rubio or Cruz someone with a much longer solid history of being an actual Conservative) to temperamental; however, in the 2016 election they posted articles justifying both voting for Trump and against him from a Conservative perspective, and once he won and during his administration though they judged him based on his actions, often supporting his policies and even cheering Trump on when he did things they actively approved of (IE, National Review loved that he continued to support Kauvenaugh rather than withdrawing the nomination because NatReview has a long institutional memory and still hasn't forgiven the Dems for what they did to Bork, and never will.) and even were a major organization involved in opposing the Russiagate nonsense, to the point where National Review was one of the only places really defending some of the people persecuted under that before it all fell apart and everyone knew it was bogus.
Most of the actual Never!Trump commentators at National Review left the publication in the early Trump admin because National Review refused to be never!Trump and instead gave him a chance.
Further National Review was one of the many publications that literally tore apart the Bragg inditement of Trump to the point that it was made a joke. Nobody at National Review would even give marginal credence to the idea the Bragg inditement had a legitimate case, and defended Trump very explicitly. They've also consistently been calling out the obvious double standards of the Justice Department regarding Trump and have overall rejected the idea that Trump represents some special threat to the Republic that demands throwing out the norms (in point of fact, they hold the exact opposite, that Trump is actually a fairly normal populist swing in Republican politics and that while Trump himself isn't a good man, the Democrats and never!Trump types are doing way more damage to the Republic than Trump did or could).
Now, that said, they did not like Jan 6th and to a degree blame Trump, and they've not been as suspicious of the 2020 election as many people would like. However, calling them Never!Trump is an exaggeration, they are not Trump supporters, but rather are principled ideological Conservatives whom find Trump a flawed and not ideal candidate, but also whom refused to let their dislike of Trump drive them insane, and instead have tried to maintain their same ideological stance without letting Trump and their relation to him define them.