How'd this guy get a commercial loan without paying down payment?

[Cee Williams]

I'm interest in finding a 6+unit property but the hurdle is getting the 20%-30% down payment required for these commercial loans despite a property having good rental income. 

Was checking out this BiggerPocket's video:

Guy mentioned he didn't have to pay a down payment, only closing costs because the appraisal versus his accepted offer amount left $30k equity in the property.  

Typically these commercial and hard money loans want 20% down. Any insight?

I've heard of seller's contingency on FHA for closing costs, but not for the down payment. Is this a commercial financing thing?