Besides margin: Before anyone is opening an account at a broker for short selling, he has to assess the broker's fee structures. That's a crucial point. When shorting stocks that are well under $1, the fees to be paid are relatively high. But a lot of pennies are loosing 20 to 30% a day.....Hence, some pinkies are worth the fees.
Anyway, you should use multiple brokers as some allow a penny to short and the others don't. You can try SureTrader, it has a lot of pennies to borrow. Interactive Brokers is another one, although difficult for low priced pennies.
Tony is trying to kid the unexperienced trader to open a long position. But with this scam of stock you only have success being short. That's the plain truth and everybody should know.