The Verdict: Need More Info
Your eligibility turns on whether your Brazilian work can end before you apply. If it can, and you can show US$1,500 a month from abroad or US$18,000 in savings, you fit this route.
The route expressly excludes work for an employer in Brazil, so Brazilian income is not neutral beside foreign income. The text does not say whether a small amount sinks an application, which leaves it to the officer.
If the Brazilian work is central to your living, the work route, where a Brazilian employer files for you, is the honest answer. Applying as a digital nomad while keeping Brazilian clients puts the permit at risk later.