binary data is not represented properly as ascii-armored

E.g. the following binary key is not properly represented:

curl https://openpgpkey.cryptomail.ch/.well-known/openpgpkey/cryptomail.ch/hu/o9r4s38sm3ywbgm89yx137jufwb8km4g

this is for the email alias: falkensmaze

The file downloaded by the frontend gives:

$ gpg --import < /tmp/o9r4s38sm3ywbgm89yx137jufwb8km4g.asc 
gpg: invalid radix64 character 2D skipped
gpg: invalid radix64 character 2D skipped
gpg: invalid radix64 character 2D skipped
gpg: invalid radix64 character 2D skipped
gpg: invalid radix64 character 2D skipped
gpg: invalid radix64 character 2D skipped
gpg: invalid radix64 character 2D skipped
gpg: invalid radix64 character 2D skipped
gpg: invalid radix64 character 2D skipped
gpg: invalid radix64 character 2D skipped
gpg: [don't know]: invalid packet (ctb=10)
gpg: read_block: read error: Invalid packet
gpg: no valid OpenPGP data found.
gpg: import from '[stdin]' failed: Invalid keyring
gpg: Total number processed: 0