Did you see the letter yourself? Is it definitely from the consulate? Or are you just relaying what you heard from your beneficiary?
There's something odd with this case. The consulate in Manila relies on SLEC for all visa medical exams. If your beneficiary had any TB-related medical findings, SLEC would not have cleared her for interview at all (I have first-hand experience with this). I have not heard of any K1 or immigrant visa applicant in Manila who was able to bypass SLEC medical clearance. As far as I know, the consulate in Manila has a policy of not allowing visa applicants to interview unless they complete their SLEC medical. That may include sputum testing if there are suspicious areas on the chest x-ray, and TB treatment if sputum testing shows positive for active TB.