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Re:OnlyKey: Open-Source Alternative to YubiKey by EthanHeilman on Thursday December 26, 2019 @10:50AM (#21884586)
Given that only key appears to support FIDO2 it seems unlikely that it pre-dates FIDO2.

>"Onlykey supports multiple methods of two-factor authentication including FIDO2 / U2F, Yubikey OTP, TOTP, Challenge-response."

Re:OnlyKey: Open-Source Alternative to YubiKey by 0x0359463 on Monday December 30, 2019 @03:01PM (#21916172)
It predates FIDO2, the OnlyKey has been around since 2016 and before FIDO2 it supported FIDO U2F.