You're not a credible poster because you're both hyper-partisan and ahistorical, not to mention ill-informed.
Do you suppose any news organizations described Trump's mostly unchallenged waltz to re-nomination in the same way they just described Biden's win in SC? I say they did.
In February 2019, the Republican National Committee voted to provide undivided support to Trump.[5][6] Several states canceled their primaries and caucuses.[7] Other states were encouraged to use "winner-takes-all" or "winner-takes-most" systems to award delegates instead of using proportional allocation.[8][9]
Trump became the presumptive Republican presidential nominee on March 17, 2020, after securing a majority of pledged delegates.[10] Donald Trump received over 18 million votes in the Republican primary, the most ever for an incumbent president in a primary.[citation needed]