E-file amended return, from MFS to MFJ, when one spouse had filed on paper

Last year, my spouse and I filed separately. We want to amend last year's return electronically & filing jointly.

IRS says "If amending a prior year return, and the original return for that year was filed on paper during the current processing year, then the amended return must be filed by paper."

My spouse had filed on paper, and I'd e-filed mine.

Can we e-file an amended MFJ return even though only one of us had e-filed last year, not the both of us?