Synthetic fuels is usually referring to synthetic kerosene which you can just feed into the existing jets as JET-1A.
Hydrogen is very-very different and needs complete redesign of the plane.
Hydrogen availability is pretty good, I mean most of the availability is not much better in CO2 emissions but with the time it would take Airbus to get the plane into commercial service getting the supply chain there would be pretty easy.
I still don't buy your argument that poor airbus has nothing it can do. If it wants to stay relevant in the 20-40 year horizon it needs to go at these hard problems now. If it doesn't then it has made a decision and might die, so what?