Sorry, but which part of 'if refused entry' didn't you understand.
If refused entry you're stuck air side in arrivals, only a return or ticket departing from that same arrival point would be of any use.
The airline was Emirates, and that was the point they were making.
The point @Caldera and @oldcpu we're making is that the only requirement (if asked) is to provide evidence of an outbound ticket from any point of departure, either by air, train, or bus.
That covers the airline from being held responsible for your return at their inconvenience and cost.
If refused entry, and you couldn't use any onward ticket, then you'd be held in detention until such time you make alternative arrangements.