I tried to allude to in my post that the contextual usage of "jutsu" within Naruto is, in the end, the most important component to the interpretation of the term. And yes, there is a more "scientific" explanation of "jutsu" in the world of Naruto. But still, I think the still very much so active, potentially "supernatural" usage of "jutsu" in Japanese is something that needs to be considered in the interpretation of the word... That's part of the "context" too, in the end.
Besides, they are technically 'techniques' in Naruto considering there actually is a "scientific" explanation for how the jutsu are performed. They use/mold chakra in different manners to various different outcomes. How you mold the chakra is just another technique.