Expired key for TeXLive 2020

[dany111 at email.it]

I've just downloaded texlive2020.iso. When I verify the sha512 with gpg signature, I receive this message

gpg: Signature made 04/06/20 15:40:20 ora legale Europa occidentale
gpg:                using RSA key 4CE1877E19438C70
gpg: Good signature from "TeX Live Distribution <tex-live at tug.org>" [unknown]
gpg: Note: This key has expired!
Primary key fingerprint: C78B 82D8 C795 12F7 9CC0  D7C8 0D5E 5D91 06BA B6BC
    Subkey fingerprint: D8F2 F860 57A8 57E4 2A88  106A 4CE1 877E 1943 8C70

I refreshed keys but nothing changed.

What's the problem? Why is it expired?