I'm just a spokesperson mostly, not a developer. I see the e-mail. The gaming license has been valid this entire time, it's been valid since it was created in 2018. But you are correct, it hasn't been properly updated still. I sent a reminder to the developers to fix this issue. Hopefully it will get taken care of soon enough.
I don't have any doubt about the license of MintDice. I'm able to verify the license from other source. I have posted about it here with a hope to see the update shortly. Because, MintDice team hasn't updated the footer yet. But the email support had told me that it will be fixed soon. I believe, it isn't very difficult to update the license validator link in the footer. I'm just wondering why MintDice team isn't showing the intention to update it while they have a valid gambling license!