It was not purged however if the return was not finished and the TT fees paid then you will have to use the 2020 downloaded program and you should be able to download the .tax2020 file to continue from where you left off ...
See this TurboTax support FAQ for completing a 2020 tax return originally started using the TurboTax online editions - https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-finish-a-prior-year-return-that-i-...
Or -
To complete and file a 2020 tax return using TurboTax you would need to purchase, download and install on a personal computer one of the 2020 desktop editions from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/
A 2020 tax return can only be printed and mailed, it cannot be e-filed.
There are no penalties for filing a tax return after the due date if the return is being filed for a tax refund.
