I'm not sure it's necessary to amend 2017 and 2018. The court case that led to the 2019 revisions was for tax year 2015. Poster's 2017 and 2018 EIC may be valid. In light of the court ruling, it's unlikely the IRS will be coming after him.
Reference: https://www.ustaxcourt.gov/UstcInOp/OpinionViewer.aspx?ID=11863
@glenthediamond - See the revised discussion at your earlier post. https://ttlc.intuit.com/community/tax-credits-deductions/discussion/re-if-my-ihss-income-is-excludab...
@AmeliesUncle
