I think that the DA9062 does not really supervise the output voltages (and generate a reset in case of a brown-out). Also, the input voltage supervision only asserts after 100ms which is to slow for some brown-out situations. Is this correct?
However, when verifying this behavior with your eval-board and a scope, the 100ms-behavior could be seen at slow brown-outs, however, on faster brown-outs, the nRESET reacted faster than expected from the datasheet. There appears to be another mechanism that reacts faster (e.g. supervision of Vddcore?), but I could not find anything regarding this in the datasheet.
Can you explain this behavior - it would be good to understand if we can rely on this, or if we need an additional external supervisor circuit for reliable brown-out reset.