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This, like most things "heard from someone" about Google is tosh. I can see where it might have come from though.
Lots of spammers used to use domains like the-loans-and-finance-people-who-sell-loans-and-finance.com (slight exagerration) so that there keywords were stuffed into the URL as well as in any link text from sites that link from the domain name.
Because this got results for a while loads of spammers started doing it and the SERPs started looking crappy. Google then tweaked a few settings to make sure that this tactic wasn't being encouraged by their algo. At this point someone probably saw all those long-dashed-domains disappear from the listings, put on their tin-foil hat and started shouting that dashes in domains is bad for your positioning, when in truth it just doesn't artificially inflate it any more.
Sorry - that was an overly long answer to a simple question. My hangover is making me ramble a bit.
Alternative short anwer : Not true
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