A transistor turns off when the base voltage is near the emitter voltage. But the emitter voltage of both PNP transistors is +12V and the base resistor voltages never go higher than only +3.3V. So the transistors are never turned off.
Your simple tutorial shows the collector of an NPN transistor turning on a PNP darlington transistor. The resistors built into the darlington from base to emitter turns it off. The NPN transistor can be turned on and off by your 3.3V powered MCU.