$USUAL 501.1M is 12.51% of the total Maximum Supply that will be released in the next 4 years. The total of 4B (4 billion). And this issuance will occur over the period of 4 years, not all at once.
The token release schedule has already been published and no one reads it. By March 2025, only approximately 20% of the Total Maximum Supply will have been issued.
The 494.6M are from the "Initial" circulating supply, understand that. It was always known that, only they don't read it.