No they were using the same kind of calculations they use for retail which weren’t accurate for classic.
The way realm population display currently works once the servers are live is that High, Medium, and Low are determined dynamically, in terms relative to the most crowded realms. So a realm with pretty rough queues (say 4k-5k) might end up showing as Medium because you aren’t Faerlina, Herod, etc. This is how it’s worked for a long time, but the unprecedented size of the queues on the handful of outlier realms is skewing the algorithm. The team’s first priority is stability and getting new serv…
Basically your “medium” realms still had queues and massive populations.