The way I interpret your claim is: that not only is it feasible in regard to the technology being available, but also that it is economically feasible _and_ the currently existing infrastructure does not need to be redone differently from scratch but can instead be augmented/upgraded to allow storage of months worth of hydrogen.

I don't think that all these are true.

Yes, the technology definitely exists.

But as far as I know there's no country (yet) that has existing infrastructure that merely needs some upgrades (with the effort for these upgrades being significantly smaller than the total effort that went into building the existing infrastructure or would be necessary for building completely new infrastructure) to enable storing of months worth of hydrogen.

So I wouldn't support the claim "You can store months worth of hydrogen ...".

You can't really store bulk hydrogen nearly as easily as natural gas, liquid fossil fuels, or coal. Hydrogen is less volumetrically efficient, leaks out faster, and causes embrittlement in common alloys.