As per usual, Flt-Bird is playing word games.
Republicans certainly were Founded as the anti-Slavery party.
They certainly did want abolition in western Territories and wanted to maintain abolition of international imports of slaves.
Every Republican was an abolitionist in his own state, and some Founders, like John Fremont, favored national abolition.
Indeed, Fremont drove Southern Democrat Fire Eaters berserk with rage over his abolitionism.
Compared to Republican Founder Fremont, Lincoln was considered a "moderate" on abolition.
But never moderate enough to satisfy Democrat Fire Eaters.
They considered Lincoln's Republican abolitionism plenty enough to justify secession and war against the United States.
So, yes, Republicans were founded as the anti-slavery party.
Of course, no Republican, then or now, was a "woke" 1619er.
As usual BroJoeK obsesses over this topic. The Republican party was explicitly not abolitionist. They went to great pains to make that clear over and over again. They were against the spread of slavery to the western territories. They were perfectly willing to live with slavery where it existed and even to enshrine it in the constitution effectively forever as well as to strengthen federal fugitive slave laws/enforcement. Fremont could not get elected anywhere nor could any abolitionist. Abolitionists were a tiny minority even in the North.