Lincoln did indeed advocate voluntary resettlement of former slaves- but always voluntary and never said anything about 'rounding them up'
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That's true but then prior to the war abe said he had no authority and no inclination to free the slaves. Then three years later he issued the emancipation proclamation.!!! .
Lincoln had no authority or inclination prior to the war to free the slaves in slave states.
Which is why three years later he freed only the slaves he had the authority to free- the slaves in the rebellious slave states.
And that lead directly of course to the freeing of all slaves.
Something you have never forgiven Lincoln for.