If I may ...
Again ... OMG! It is considered a temporary, portable, structure! That permission slip you linked to is for permanent structures that are then used as part of the calculations for property taxes. JHFC! Just like mobile homes. They are not considered real estate until the home and land have been “legally joined” via legal paperwork, and the relinquishing of the home’s physical Title. Mobile, (manufactured) homes must be secured to a permanent foundation and are added to the real property’s legal description.
Unless you live in a HOA, or some other controlling type neighborhood with restrictions, you do not need anyone's permission to put a shed on your property. Are you going to permanently secure that shed to a foundation and make it part of the land? No, you are not. Why? because if you do, then your property taxes will reflect that new structure. Why do you think so many people get these sheds? Huge ones at that. Because they pay no property taxes on them and don't need any permission or permits to do so.
Good god, stop being that person seeking government approval for everything. That's why the country is in the shape it's in today. Stop living in fear of the boogie man in the government office.