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This was my mistake! It's not too short. I search-and-replaced my h2 tags with h3, which broke the key. Oops.

I've fixed it now.

Now it works, nevertheless it still is (too) short, because you are using a soon-to-be insecure key size:

"In 2010, France’s Agence Nationale de la Securite des Systems d’Information stated they had confidence in RSA-2048 until at least 2020."

:( That was the default size suggested to me by gpg.

2048-bit RSA keys are still very common and the least of your worries for quite a while.