Implicit knowledge might work. Implicit most often means something that is understood but not stated outright, which is somewhat like your description of un/subconsciously knowing, but there are also more specialized usages that are closer.
Specifically, this sounds similar to the psychological concepts of implicit memory and implicit learning.
Implicit memory is sometimes referred to as unconscious memory or
automatic memory. Implicit memory uses past experiences to remember
things without thinking about them. The performance of implicit memory
is enabled by previous experiences, no matter how long ago those
experiences occurred. —Kim Ann Zimmermann, "Implicit Memory:
Definition and Examples", Live Science
According to Wikipedia,
It is acquired and used unconsciously, and can affect thoughts and
Implicit learning is a bit more controversial, but it also fits your meaning. From Wikipedia:
Implicit learning is the learning of complex information in an
incidental manner, without awareness of what has been learned.
Thus, in your sentence:
If we assume that the model is applicable, it tells us what we've
implicitly known for a while.