One of the guys in the post you found watered his plants with mt dew and claimed using a blow torch got rid of fungus gnats....he didnt even seem to believe this one...made me laugh a bit.
Again i have heard this before as well, but only from pumpkin growers who inject it into the stems. Also read somewhere in an article about milk feeding microbs in soil to break down the calcium and yada yada, but no pictures showing amazing tomatos grown in milk fed soil either.... I tend to apply the same pics or it didnt happen rule to all forums though