Is there a way to avoid being roped into the deluxe upgrade to file after falling for the “free free free” advertising ?

The Free online edition is only for very simple tax returns that do not require any other form or schedule to complete the tax return.  Otherwise you need to upgrade to the Deluxe edition or higher.

Use the TurboTax Free File program if you are eligible - https://freefile.intuit.com/
If you are eligible you can use the TurboTax Free File Program which is free to file both a federal and state tax return. The Free File Program edition is a full featured personal tax program and on a separate website from the TurboTax online editions.

To qualify for free 2019 federal and state tax returns with the Free File Program, you'll need to meet at least one of these requirements:

• A maximum 2019 adjusted gross income (AGI) of $36,000; or
• You qualify for the Earned Income Tax Credit (EITC); or
• You served as active duty military (including Reservists and National Guard) with a maximum 2019 AGI of $69,000 (you'll also need a military-issued W-2).

See this TurboTax support FAQ on the Free File Program - https://ttlc.intuit.com/questions/1900583-what-is-the-turbotax-free-file-program

See this TurboTax support FAQ for the difference between the Free File Progam and the Free edition - https://ttlc.intuit.com/questions/2572617-what-s-the-difference-between-free-file-program-and-free-e...

And see this TurboTax support FAQ on how to switch to the TurboTax Free File Program - https://ttlc.intuit.com/questions/2026912-how-do-i-switch-to-turbotax-free-file-program