He amended his statement to "less canon." It is more canonical that Sensei will sleep with every girl he can as soon as he can and gets the lust scores up, so the most canonical Sensei is with Sara, Haruka, Maki, and Ami (the currently optional girls), bad homied Rin, saw Prisoner and What a Wonderful World, etc. But it's not noncanon for a Sensei to not experience those. The stuff that would be outright anticanonical for him to do is not a choice, he just won't do it. Every Sensei assaults Yumi on the bridge, every Sensei sleeps with the mandatory girls, etc. So there's no way to derail the plot into noncanon territory, there's just a bundle of different interpretations of Sensei, some of which are closer to the character Selebus imagines than others.