He was directly contrasting it to what he'd noticed in the last iteration of phones: that they'd had such abrasions after only two days. Thus, while he couldn't

He was directly contrasting it to what he'd noticed in the last iteration of phones: that they'd had such abrasions after only two days. Thus, while he couldn't definitively assert the new back was better, it is a positive sign that it does not so far exhibit the same defect the previous phone had. He is not stating that 6 days without abrasions is, objectively, a grand achievement. Is reading for comprehension such a high bar to aim for?