To clarify-he stored them in a box with vermiculite and he damped the vermiculite-he did not say keep them moist -just not to completely dry out-I find they seldom completely dry out and I cover mine with newspaper
His were kept in frost-free greenhouse where the temperarure did not drop below 5c as I recall so pehaps a tad warmer than usual and he also said to inspect them occasionally-good advice
If you think about if kept in the ground they are never going to dry out and always be moist
It is as usual what works for you-ignore what you l like-but why "as ever" Hostafan 1?