If someone is able to make a noise whilst coughing then some gas is getting into the lungs. Applying a face mask that doesn’t supply oxygen at this point may a) freak them out to the point that they lose their airway b) prevent gas getting to the lungs for the duration that the mask is applied.
In order for the thing to work the airway needs to be held in a position in which the upper airway would normally be patent (if the bolus of whatever wasn’t there) and the mask held on with one hand whilst the other deploys the suction. Holding an airway patent and face mask on well enough to have a ‘proper’ seal is not always that easy and does require proper training. It is not difficult to actively obstruct the airway with poor technique (which would make the situation worse).
The suction it claims to generate is not insignificant...in fact it’s probably enough to suck stomach contents up into the upper airway, therefore adding vomit to the scenario and making things even messier.
The standard advice is to do whichever ‘dislodging manoeuvres’ are age appropriate for the patient and to start CPR if consciousness is lost/breathing stops. The chest compression element of CPR may generate enough positive pressure to expel the obstruction. Positive pressure ventilation (eg mouth to mouth) may push a small item down far enough that it’s only obstructing 1 lung (which is still pretty bad, but arguably better than obstructing both).
When you start introducing fancy ‘toys’ to an emotionally high-stakes emergency scenario (even in hospital) inexperienced people may become distracted by the kit to the extent that the basics of management are ignored.
From watching the you tube demo... you’ll notice that the vacuum is lost pretty quickly when he used it in the girl’s thigh. It doesn’t matter if the patient can talk or not...if their cough generates noise the airway is not completely obstructed. His comment that you may need to ‘use a finger to open the airway’ is absolutely wrong. His comment that you can continue to use the mask repeatedly until paramedics arrive is also dangerous. If your patient has stopped breathing/had a cardiac arrest they need CPR.
IME, until this device has a proper evidence base (not just a few case reports) then you’d be far better off sticking to the standard management.