You were exempt from counting US days of presence for 2 years or part years. So you were a nonresident for 2017 and 2018. Starting January 1, 2019, you had to start counting your US days of presence. Please see example 4 in following link just to see how to count the exempt years. Alien Residency Examples
I am not sure that the US French treaty exempts you for 2 full years, instead it is more likely to exempt your compensation for 2017 and 2018 while you were exempt from US days of presence.
You should enter your W-2 and 1042-S forms (as indicate in your link above). Your W-2 I assume is for October to December 2019 wages. As such it should include your wages and include federal and state tax withholdings.
If you are eligible for a tax treaty, you would need to file a Form 8833 and claim the treaty exemption as a negative amount under "Federal / Wages & Income / Less common income / Miscellaneous / Other Reportable Income ".
You will need to attach Form 8833 and print and mail your return .
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