Pretty standard right wing whataboutism lol "bu-bu-but what about this thing that happen 150 years ago??? Clearly the Democratic party still wants slavery!!!"
Even though the names of the two major parties haven't changed since 1854 (when the Republican Party replaced the Whigs), the ideological alignment of them has continued to shift, at least five times in total (or maybe six, if you count MAGA christo-fascism as separate from what the party was before).
I’ve always thought the MAGA phase was just an extension of what the party became during the George W and Obama years. Trump just exploited what was already there.