Everything is possible until proven impossible.
This is argument from ignorance.
There is no proof that X is true
Therefore X is false
You said it's possible. What makes you think it's possible?
If it were the other way around, we wouldn't have any technology at all. The DSS and FSS are designed, built, and used by humans, subject to human limitations through all processes. The probes supply the data, to improve the guess.
I believe you are discounting the fact that the FSS already found the bio, and that the probes actually tell you which bio is present. That's not a guess, else it would have a margin of error. The search area illustrated by the map indicates what has been stated already, an area where the conditions exist to best support the bio.
If we were instead talking about fish, the FSS would find the life form, the DSS would find that the life form is in water and then separate the species of fish by which type of water the fish will normally survive/thrive in. For example, it would find yellowfin tuna, marlin and swordfish in pelagic ocean waters, and grass carp in fresh waters. It would say "Carp, Tuna, Swordfish, Marlin". It would not be guessing where these are. They are of necessity in the water.
There is no way to prove these systems are 100% accurate, so anything is possible.
Universal negatives are not worth exploring. Without evidence of something being true in the game, there's no reason to consider it true. If it exists, there must be evidence else it's a moot point.