From that person's link:

The guideline applies to the vast majority – approximately 1.4 million – of rental households covered by the Residential Tenancies Act. It does not apply to rental units occupied for the first time after November 15, 2018, vacant residential units, community housing, long-term care homes or commercial properties.

Because they can't bleed their tenants dry otherwise.

It's not enough to have someone else paying your mortgage for you, you need to be cashflow positive each month as well.