PSB taxed at higher rates. PSB is taxed at 39.5% in Ontario, as the article mentioned. But if you pay all the net income to yourself as salary, you expense it and zero it out on the corporate level. So who cares what tax rate it is if the taxable income is zero? No-one.
Same goes for the US, by the way. Personal Service Corporations are taxed at flat 35% Federal tax rate. But if you pour all the income into your salary - its moot, because there's no net income to pay tax of.
If it's too complicated to figure out, maybe it would be wise to hire a tax accountant to provide counsel to you before you make decisions about your business.