That is a complete understatement to say that whatifaltist is a niche celeb. He has hundreds of thousands of subscribers on his channel, people made several videos on his content, heavily criticized him for his cringe (and possibly fringe) political theories and beliefs, word salad takes, and taken the piss out of him for having lolcowsque mannerisms. His channel now has 551k subscribers and numerous followers on his other socials.
His historian status is also dubious at best and laughable at worse, since he only reads sources before the 1960s - 1970s because of "muh historical traditionalism". He hasn't got a degree in history and other facets of him being an untrustworthy person to get your arguments from and much else.