I'm generally not a fan of creating a profile when we have no information on a particular individual (though, based on the way that the internal database is designed, WikiTree does create such a parental profile when a sibling relationship is added to an existing profile for which no parental relationships exist).
Having said that - since Amerindien-1 is an existing profile created to represent the biological father of Germain Doucet (Doucet-19), I believe the Amerindien-1 profile should be connected as the father of Germain.
If it's decided not to make that change, and if the DNA sources indicate that the currently assigned father is not biologically related to Germain, the existing paternal relationship status may need to be changed to non-biological. That would prevent any additional future DNA tests that may be added to the relatives of Germain and/or his non-biological father from incorrectly propagating through that relationship. The two existing auDNA tests reflected on Germain's profile at this time (both test-takers are 8 steps away from him) don't happen to propagate to his father, since his father is out of range for auDNA propagation (9 steps away) for both of those tests.
The notes in the bios of the profiles should be updated if they are impacted by any change.