Yes, that is what the center resistor is for, to get some forward bias on the two transistors. It is not a very good design. The base-emitter junctions are temp dependent and as they get hotter the current will get higher. Thermal runaway is possible.
Usually two mirroring diodes are used in place of the center resistor, sometimes with a small resistor in series to adjust output device idle bias.
Hopefully the OP is aware that the circuit he's posted isn't a practical design, just a theoretical model to show the principle - it's a long way short of a working design.
Mostly the 170 ohm resistor is replaced by a Vbe multiplier, which allows you to adjust the current - using diodes requires special diodes, and is fraught with more problems.