honestly, it sounds to me like a massive air block, and your heater tap is rooted, I'd jump down to SCA and pick a new one up for $25, flush your system again, with both hoses off rad and engine.
install heater tap,(turning hot on dash) flush engine with garden hose from water pump, so the flow comes up the engine. Then, into thermostat inlet, and down flush.
install, bottom rad hose to water pump, fill rad. then install top hose on rad. hold top hose above thermostat, and fill till flowing out thermostat inlet. connect top hose.
fill overflow bottle, and yeah flush the hose from rad to o/flow, open bleed screw
turn engine on, get warm. (usually I wait till the thermo fan kicks in) if still bubbling out and not a stream, there is a major air block, and you may need to high preassure flush the system.
but if there is no sign of bubbles, or what you were experiencing in the vid. then all cool, should be blowing hot air in your face,
I just flushed my system 2 weeks ago, and had the same issue, but it was my h/tap that had **** it self.
hope that helps.
where bouts in melb r u ?