Genesis block time is correct in Unix time, but human readable version is off by 10 minutes. (Single digit typo)
Basically this changes the fingerprint, so should be consistent so as to ensure compatibility between BIP85-GPG implementations.
(I am comparing my SeedSigner to Krux GPGap in this instance, the latter of which has gone with the human-readable time from the BIP whereas I went with Unix time and couldn’t work out why the same input produced different results…)