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Hiroo Nagano seems to confirm his work via liking tweets from the booru bot account, for example:
https://twitter.com/sakugabooru/status/1347990029562486784
https://twitter.com/sakugabooru/status/1292145555179802625
https://twitter.com/sakugabooru/status/1215942936564772864

So I think it's safe to at the very least presume some posts based on that info