1. It’s obvious nonsense brought to you by proven liars.
2. The point of propaganda is to leave an impression after the details have been forgotten.
3. To get involved in discussing the minutiae of the story is to help the propagandists’ aims.
4. Therefore treat it as a badly constructed story that is failing to convince.
5. Do this by analysing the comments on the news stories which (at least the ones I’ve looked at) show that people are sceptical.
6. Also mock the meanderings of the story: At the restaurant! In the car! On the doorstep! Incredibly lethal but strangely ineffective. Miraculous recovery of daughter. Baby wipes as effective protection. Reminiscent of White Helmets and their flip flops, rubber gloves and paper masks; but, come to think of it, it’s the same authors in both stories. Who, after so many lies, are becoming overconfident and sloppy.

It’s a startlingly incompetent theatrical production and should be responded to with contemptuous mockery.