I didn't describe anything as straightforward, the fact remains that there are limited goods/properties/commodities that are in demand, not just money. It's not up to me to show why it's exactly like money because that was the only property of money used to describe this detrimental problem, it's up to the person who says that is a problem with deflationary money. Money can also be taxed too, so that also is insufficient to make the case for why it is different than land. Or alternatively you could take a limited non-renewable commodity (say, copper) that is in demand but not taxed. Also you have still not addressed that increasing value of money naturally reduces the required amount of it necessary for making a particular trade. A fairly striking omission when claiming there are feedback spirals in such a system.