One can only conclude that those who leave off that last sentence are intending a modification of his oft-expressed wish that all men every where could be free.
While you like to whine about not including the part about his personal wish, Lincoln’s letter to Greeley expressly spells out that his overruling goal was to preserve the Union.
And he says that if that meant not freeing any slaves then that’s what he would do.
Those are his words. Abolitionists like Greeley and Marx publicly criticized Lincoln for his failure to act and he was responding to them. John C Fremont had issued an emancipation proclamation for the western Territories and Lincoln fired him for doing it.
Lincoln’s own emancipation order didnt free a single slave in the loyal states that remained in the Union. The 13th Amendment in December 1865 accomplished that 8 months after his death. Had this been his primary goal it should have been possible as soon as he took office. There were no longer enough slave states remaining in Congress to prevent it.