Trump won the highest percentage of the POC vote of any Republican in 60 years.
That's not ncessarily true. What's true is that Trump's voting coalition internally included the highest percentage of POC (26%) of any Republican presidential candidate in 60 years.
However, Trump's overall percentage of the national POC vote share was really approximately the same as that of Bush in 2004 (very exact figures are difficult to find or might not exist); but Bush in that election won much more of the white suburban vote (white suburbs were red and not blue at that time in history), and therefore the national popular vote overall. Trump's 2020 coalition was indeed more POC than any other Republican candidate in modern history, in proportional terms, but that's because he did so poorly among suburban and upper-class whites who were traditionally always the base of the Republican Party and only shifted dramatically to Democrats in the past two elections. Between 2016 and 2020, Trump did indeed improve among all racial groups other than whites, and improved even slightly among rural whites from a very high mark in 2016, while a seismic blue shift happened in the white suburbs. In other words, no Republican in 60 years has had such a racially diverse voting coalition in its proportional makeup, but that's because of an unprecedented white suburban shift to Biden, not because of an unprecedented POC shift to Trump.