Yes, I see the ambiguous wordings. To be on the safe side I would apply the 48h from the depart. time of your MNL-DOH flight. Maybe you will be able to rely on 48h before the initial domestic flight from TAC in the Philippines but there is no guarantee that QR staff at MNL will agree if you are outside of 48h when you approach the MNL checkin counters or the gate for document verification; IMO there is a significant risk that you may be denied boarding if your test is done earlier than 48h before depart. from MNL (but later than 48h from the domestic origin) also because the check-in staff at TAC most likely will not inquire/pay no attention to your Covid test result but will leave that to MNL.