The Southern Poverty Law Center is an activist organisation which will label just about anything as "far right" which does not fit their narrative [1]. Using them as a reference for something being related to far-right individuals and conspiracy theorists, and for hosting hateful material makes the claim less believable. This does not mean BitChute does not harbour such material - given the fact that BitChute does not censor content it is likely to be present, just like it is likely for it to harbour far-left individuals and conspiracy theorists - but SPLC calling something bad just means they disagree with whatever the something does.
[1] https://www.washingtonpost.com/opinions/the-southern-poverty...