What
A new internal value called storedLoginPinned has been added. It is filled in by a helper that always returns false, so it never switches on in this build.
Why
In practice nothing changes for you. The value is present in the code but cannot take effect.
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
The finding does not say what pinning a stored login would do if it were ever turned on.