I don't doubt Cooper's assessment at all. His evidence is that India's managed to accurately put a lot of precision ordnance on target, as opposed to Pakistan.
It was almost becoming the case that India had us pinned down.
We were just not prepared for this war and Indian missiles/ drones/ AD had rendered our defenses inadequate. We were starting to take severe losses and a ceasefire was thankfully enforced, before Pakistan military's failure was fully exposed.
Nothing outrageous this Tom Cooper's claimed.