Unfortunately Sam Knows will go off the BT wholesale info and as everyone knows that changes constantly and it seems is never right in the first place! Samknows is only as good as the info provided by the Communication Providers.
The odd thing about the samknows checker for fttc is its quite specific. Its not just taking info off the BT checker, posting it up with a lag and then assuming its active when the date is passed. Its getting quite specific dates from somewhere that are vaguely close to the BT dates and then say its available in some areas. It kind of acts like it knows what its talking about I just don't know what there source of information is.