I don't see that being a uae national is a requirement for point 1, I see point 1 as more as what it is in UE countries, where you are considered resident if you have the center of your personal and/or economic interests in dubai and you are resident of Dubai.
A good example is that if you have wife and kids in︀ europe, you can spend 365 days in Dubai, but when you re enter the country,︁ you will be taxed as the center of personal interest was the EU country. This︂ happened for lots of soccer players who went to dubai to play but had family︃ in EU. Same would apply for dubai, if you stay in dubai less than 90︄ days because your work requires travelling abroad but you have your family in dubai and︅ you have true business in dubai, you will be considered a tax resident in dubai,︆ which could mean nothing if you also trigger residency in other places. It all depends︇ on what your business is and how it is structured.
As often discussed, as a︈ digital nomad, the most important thing is how you exit your home country and how︉ you severe ties: most EU countries consider you as still resident in the country if︊ you move to UAE unless proven contrary, for 2-3 years. so the tax authority will︋ likely check on you, and you better have solid answers ( which if you don't︌ have family or kids, means having at least a tax certificate in dubai and not︍ spending too much time in your home country ). What matter most is whether the︎ tax authority comes after you ( which is unlikely if you are 22-25 years old️ and never paid serious taxes, really likely if you are 40 ) and what you risk if it does, I mean if you risk prison, or a fine. After that, it's all risk/reward.