This is a very exaggerated extrapolation from some experimental findings discovered in 1916. A researcher named Bateman fed rats a diet consisting raw eg whites as the sole source of protein in their diet. These rats did develop problems, however, you must note the sole source of protein in the diet was raw eg whites. The average diet provides about 100-300 ug biotin daily and the biotin syntesized by intestinal flora is available for absorbtion. The only way for a human to become deficient in biotin is to eliminate intestinal bacteria and restrict the diet to biotin deficient foods
If you want the citation to look up in the library I can provide that for you.