There is not much here for those who want to guess at legislative intent.  But which do you think it's more likely, that Congress wanted to accomplish?

1)  "As long as you worked a little bit in 2020, even if you only made $10, we are going to give you EIC based on your 2019 earnings."

2)  "We recognize that many people had no income in 2020.  They may have worked seasonal jobs for the last 20 years, but the jobs disappeared when the pandemic arrived.  So we will let them claim EIC based on their 2019 income."