It's the training wheels of NASCAR. Even F1 drivers and rally drivers that want to become NASCAR drivers do a season of ARCA to get used to the rules, speeds, and "the feel" of the race itself.
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However, the way that Cody Dennison goes on about ARCA you'd think it was NASCAR just typo'ed. My thinking is, this guy had a dream of "goin' fast". Very much the Ricky Bobby plot, and he found a way to be a stockcar racer, without having a multi-million dollar racing team behind him.
I'd consider it noble, if not for the fact that he clearly isn't comfortable at high speeds and he probably thought the CRUISIN' USA arade cabinet at Pizza Hut was a racing sim.