This is exactly his case: to be de-registerd you need at the same time be registered somewhere else.
If you don't become tax resident somewhere else they won't let you go.
This is not true in such absolute terms. Yes, some countries are like that, and have always been like that.
But there also are many countries that aren't like that at all.
This is a quote from Andrew Henderson and while i don't agree on many things he says, I do 100% agree on the
nomad tax trap.
Obviously, if "they never met all of the requirements to become a tax non-resident in their home country", then they would get in trouble.
You can also get in trouble if you return to your "home country" after a few years of nomading - they could say it was just an extended vacation and you never really left from a tax perspective.
But something like "you have to pay tax in your passport country if you don't get
tax residency" is just bulls**t.
To take an extreme example, even if you don't get
tax residency in Costa Rica because you don't have a local job (so you don't pay local taxes), most countries should recognize that you've permanently moved to Costa Rica if you spend 183+ days there and 0 days in your "home country".
And I don't like the term "home country" because it's such an outdated system.
Say a British-Swiss couple living in Dubai travels to Brazil and their kid is born there. The child would probably be eligible for
citizenship of the UK, Switzerland and Brazil, but grow up in the UAE.
After graduating from highschool in the UAE, the child moves to Costa Rica, where he/she doesn't have tax residency because they don't have a local job.
Their UAE visa isn't renewed because it would cost the parents money to have an additional visa and the child also isn't in the UAE anyway (would also require a new medical exam).
So now you have a person with three different passports living in Costa Rica, where that person isn't a tax resident, and that person also cannot be a UAE tax resident (where they spent all their life before moving to Costa Rica), because that would require 183+ days in the country or a residency visa (but they didn't spend a single day in the UAE).
Are you going to tell me that person owes taxes in Brazil, the UK and Switzerland, despite never having set foot into any of those countries? What is their "home country"?
It's an extreme example, but it shows that what you wrote definitely isn't some general truth.
However, for some countries like
Spain or France, it might actually be the case that you would have to show them a tax residency
certificate from some other country as proof that you've really moved somewhere new.
But that's specific to those countries and it usually has nothing to do with your citizenship - but rather with how long you have lived in that country.
The real nomad tax trap is returning to the same country (especially your citizenship country) after a few years abroad. That's when they might really start investigating. But even then, a tax residency
certificate might not be required.
It's always the domestic tax law that is relevant, and very few countries have anything about citizenship in their tax code. You can have a look at the UK tax residency rules for example, they are extremely clear. If you don't match any of the criteria, you aren't tax resident, period. I even know a guy who was working for a
UK company as a
digital nomad. He was living in the UK before and then went nomad, HMRC accepted that without any issues. He only had to prove that he didn't have an apartment in the UK and that he wasn't spending much time there. He legally lived tax free (and now he has settled somewhere new, but that's a different story).