Yes, you are correct that income received from a Foreign Source may not be taxable in the US due to a Treaty Agreement.
Income you earned in the US is taxable in the US.
However, if you are a Student on an F1 Visa and arrived in the US in August 2019, you have not been present in the US for five years, so you would need to file a Non-Resident return through Sprintax.
TurboTax doesn't ask about your visa status, since it assumes you are a Resident if you are using it.
Click this link for more info on F1 Visa Status Filing.
This article has Tax Tips for Resident and Non-Resident Aliens.
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