It would only be good news if Tagon wasn't wearing armored underwear, and he specifically said it was the worst good news he'd heard. So we can safely assume he's NOT wearing armor of any kind under his armor, and I'm sure the suits can be recharged safely in combat situations, so, even though the rations may not be very enjoyable, nobody in the suits will die of privation. Boredom, maybe, but not privation.
Tailor called it 'good' news, then added qualifiers. If the qualifiers were unimportant, Tagon would have called it 'mildly uncomfortable good new', but since he was clearly asking about catheter functions, he wouldn't have much grounds for complaint.
Since Tailor's qualifiers about armored underpants apparently ARE relevant, the quality of Tailor's so-called 'good' news has severely deteriorated, and Tagon is therefore referring to it as the 'very worst good news I've heard all day"