The "Poplar Report" video on youtube (I'm not going to drive view counts by linking it) is much the same. Anecdotes, unsourced "someones", very short on detail, long on speculation, no offered mechanism of doing this. Which video came first, I couldn't say.
and the offered remedies - feed more corn, feed more oats, feed more scratch, feed less soy, and now feed goat feed (among others) all demonstrate a woeful ignorance of poultry feed science and the nutritional values of the offered substitutes. At least when people say "feed cayenne pepper to warm them up in winter" it does no harm, and may keep the rats out of the feed.