No, he's not kidding.   ...and Yes, tenant gets a 3-day notice, plus a late charge assessed on the 2nd.  
Tenant also receives notice that tenant will be held responsible for Landlord's eviction and court cost from that date forward.  Landlords usually expect all hell to break loose at that point, so landlords take precaution by putting law enforcement on notice, in case of any property damage.  Law officer serves tenant with "Summons and Complaint" after day 3, which tells the Tenant when his court date is--but by that time, it's too late. Landlord will ask court for Judgement of possession, plus financial costs.  ...Court drafts a Writ of Restitution (ordering removal of tenants belongings), ...Sheriff shows up while Landlord puts Tenants' stuff on the curb and changes the locks.  It all happens faster than you might think!