Source: I'm a Ukrainian still staying in Ukraine because I believe the above is true. Otherwise I'd move to EU with very little effort or to Russia with no effort at all.
I'm not going to discuss all of your wrong assumptions, just mentioning "closing media". Do you know the narrative those media were spreading? Do you know who is Medvedchuk? These media were pro-russia propagandists.
Am I wrong that all the industry in Ukraine was destroyed (aviation, shipbuilding, cars and trucks, etc)?
Am I wrong that energy consumption in Ukraine is declining (means that industry and/or population are declining)?
Yes you are. You showed (without evidence but let's assume) that $40bn of agricultural exports don't cover the $60 of Ukraine imports. Only 15% of people there work in agriculture. The other 85% of workers are just as capable of creating value for export.
> Am I wrong that all the industry in Ukraine was destroyed
Yes, and it is so obvious a lie that it strains credulity. Even just ignoring the well known mining/iron ore/iron/steel/pipe industry that has at least a dozen well known big companies. Plus of course Ukraine manufactures a lot of other things from cars to armament to confectionary.
And if it came to an export/currency collapse people would and could adapt and buy the local food/cars/trucks (even if they don't have the same quality or variety as foreign goods).
Nor does it help the Ukraine. All the industry was destroyed in the last 30 years. And agriculture is not enough: if you seed all available land of Ukraine, it would produce only about $40 bln of agricultural products, while Ukraine yearly imports from abroad are $60 bln. The country is unsustainable, it would eventually collapse. It's not the only country in the world that consumes more than it produces, but other countries have some kind of advantages allowing them to subsist while being netto importers. E.g. USA also consumes more than it produces, but it can freely print world reserve currency and buy whatever it needs. If someone objects, it has most expensive army with bases all over the world to suppress any discontent. Ukraine doesn't have a single possible way out.
Eventually people that have any skills and energy will migrate to Europe/Russia/other countries (I was constantly surprised how many there're Ukrainians working in every part of the world - even the most remote ones), existing population will wither. There's a conspiracy theory that Ukrainian government is afraid to organize population census (the last one was long time ago), because they know that results will be unpleasantly surprising.