Mechataur’s spell text says it does splash damage, but as the hint box on the right indicates, in reality it does Light Splash Damage.
This message is more of a FYI just for the record for fellow players, given the miniscule chance that this will be corrected. (In fact, considering the apparent very limited work capacity of the developers, I would much prefer that they fix the more serious bugs than bothering with this one; hence this message is not under “bug report”.)
Technically, it’s unclear if whether the text or the spell is incorrect. We’ve been wondering for 3 years now. Unfortunately, the issue doesn’t affect the cash shop, so it will likely continue to get ignored.