That’s right, IPNI are names, POWO are taxa, two different disciplines of science. To assess if a name applies to a taxon, the literature needs to be read and experts consulted so that is not instant and POWO probably wants to see how the wind blows before considering something accepted or a synonym.
That is the same issue that is much discussed here on how long to wait until a change/deviation should be implemented.
https://forum.inaturalist.org/t/should-curators-have-a-critical-point-of-view-when-changing-inat-taxonomy/46339/24
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