Lego had already put out a number of licensed sets featuring specific ‘real people’ (Star Wars characters) using just yellow minifigs. That changed in 2003 (same year as the NBA license) when they released the Cloud City set, and evidently came to the realization that they could not continue to use yellow for all characters. That set includes yellow Han and Leia minifigs, by the way - white skin tone minifigs came later.
The point is that if the claim which, yes, Lego has made since 1978, that yellow was neutral and could represent any race – if that claim has any value, they could have proudly released 10123 Cloud City with a yellow Lando.
They didn’t. Yellow turns out not to have been as neutral as they believed. Lando proves it.
As for Lego vs the Simpsons I didn’t claim any causative influence between the two - just pointing out that Simpsons made the same choice, with yellow representing white people, and nonwhite people having different skin tones. Both Lego and the Simpsons have accidentally encoded a white default under a ‘nonrealistic color choice’.
My point is that emojis have done exactly the same thing.