I remember the claims and counter claims over the yields and materials used by the Pakistanis. The plutonium-trace analysis had been disputed by US agencies themselves and I don’t think the Pakistanis would have been dumb enough to burn off their stockpiles in a few hours.
Regarding seismic readings, even that has been disputed.I’ve heard the same about the Indian and North Korean tests and Chinese tests earlier. And it’s not like seismologists are in agreement on these.
Agreed, the results were very hazy and disputed. Bottom line, Pakistan shouldn’t have any enriched Plutonium unless they bought it somewhere. With all the HEU they should have by now, why not test a uranium based bomb?