No. You are mistaking it for William Seward's alternate proposal to the Crittenden one.
That was a Democrat proposal, if memory serves.
Seward was a Republican. He proposed the text you just quoted at The Lincoln's bidding in late December 1860.
The Crittenden proposals predate the Seward proposals. During the first months of 1861 there were compromise proposals flying left and right. Some build upon others, and it appears that Seward took the amendment idea from Crittenden since his proposals came first. Of course then Seward added the proposals for jury trials for fugitive slaves and it all blew up.