Harvard accepts
some of the best students in the world, others get/got in with far less credentials but because of immutable characteristics.
What makes this argument moot is that Harvard has been one top universities on the planet since the late 19th century, there is undeniable data about the increase in A's beginning in the 2010s. From the data that I have seen, circa 2005, about 24% of grades at Harvard were A's. By 2020 it was 60%. Attempt to explain that away.
This is definitely not an elite U thing, it is everywhere. Large-scale data
https://www.future-ed.org/grade-inflation-hits-high-school-math-hardest/ suggests there has been significant increases in overall GPA in high schools across the country since ~2010 while standardized test scores have dropped. There are now elite universities that offer a host of remedial courses. This is "equity" in the real world; everybody gets an "A" regardless of their work output.