Not the same thing at all. The capacity being capped at 500K doesn't mean players won't attempt to log on if that cap is reached anyway. We also know the player base blew past that capacity because thousands had connection problems due to the servers being overloaded. Additionally, did the dev say the total?
Edit: I checked. Read below.
If Wukong had already sold over 30M, the dev would have almost certainly told us about it. This is a game whose sales are largely driven by the Chinese PC market. It's doing well in the west, but it's not close to China.
If this guy is reliable, then that more or less checks out with what Arrowhead said.
This was the peak on Steam at the time of the tweet.
345K on Steam + 155K on PS5. PS5 had 31% of the total. PC had 69%, so over 60% as this guy said.