They want to say that non-whites are naturally dumber than whites. There will be varying degrees of subtlety but that's what the dog whistlers are on about.
If these numbers are at all meaningful for determining how much a student has learned as a result of going through schooling, then thye show that white people are consistently better than blacks and Hispanics at school and are consistently worse than Asians.
I'm so relieved I left social media. Sadly, via democracy, even if you leave social media you are still impacted by those who use it and believe what they read.