There is something wrong with this article. According to this article a day trader can never deduct a loss if he/she trades the same stock all the time. If this is the case there should be much more people suffering from the wash sales rule than just one guy.
Yeah the article doesn't have all the information. A 30 day window is required to buy something back after it's been sold to prevent a wash sale. If it's been sold permanently for more than 30 days then the wash sale(s) aren't enforced. The IRS doesn't have the manpower go through every single persons taxes and make sure this is enforced across the board though. I'm sure they look at size and random samples.