You are NOT forced to file a 2019 tax return with TurboTax, you can file the 2019 tax return with anyone that you choose.
The Stimulus Registration is ONLY if you do NOT have to file a 2019 tax return and you are NOT required to file a tax return and you do NOT receive Social Security benefits, then use this TurboTax website to register for the stimulus - https://turbotax.intuit.com/stimulus-check/