This appears to be a bug. I filed <https://phabricator.wikimedia.org/T186648>.

The API should still be available, it is listed here: https://en.wikipedia.org/w/api.php?action=help&recursivesubmodules=1#query+projectpages

You won't find it on API:Lists because it's provided by an extension: <https://www.mediawiki.org/wiki/Extension:PageAssessments>.

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Bartosz Dziewoński

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