That he did, as was frequently the case with Lincoln. You will never get Walt to admit it though, as he has convinced himself of Lincoln's diety level of perfection. He will never concede a fault in his false god - not even that Lincoln forgot to tie his shoe lace one morning, much less that he sinned or lied.
One time I pointed out Lincoln's lie over the very subject of this thread's article - the other 13th amendment. In addition to endorsing that amendment in his inaugural address, Lincoln claimed to have not yet read the text of it in that speech as of March 4, 1861. To demonstrate that this was a lie, I posted a December 26, 1860 letter to Lincoln from William Seward in which the latter informed the former that he had proposed that very same amendment before committee. I also quoted an eyewitness historical account sayin that Lincoln lobbied Congress extensively on the amendment before his inauguration.
Along with the fact that he paraphrased the amendment in his inaugural, both are conclusive proof that he was lying when he claimed not to have seen it on March 4, 1861. But Walt couldn't even bring himself to admit that! He actually adopted a line of argument saying that Lincoln recieved Seward's letter and worked to pass the thing, but had never, in all that time, bothered to read the two lines of text of the same amendment he was pushing and paraphrasing in his speeches. It was basically "yeah, he did all that stuff with it but he never read the thing while he was doing it"!
I'm afraid that Walt is beyond the help of any sane person on matters such as these. He is not in the business of history. Nor is he even in the business of simply respecting or upholding Abe Lincoln. His trade is the worship of Lincoln and his method is to stomp out, decry, and belittle anything and everything that does not share in or lend support to his act of idolatry.
Given his often fantastical positions, History is not his friend. In fact, it is his worst enemy.