This question - How many days are there in each year of the 304th Metonic cycle? - and similar Metonic ones are being asked by the same user.
Can one simply point him to the relevant literature (e.g. https://en.wikipedia.org/wiki/Hebrew_calendar) and mark it as off-topic?
There's nothing "Jewish" about helping this user with historical calendar information. (Except for "doing them a favor, maybe.)
Add to that the fact that the Wikipedia page on Metonic Calendar says that the Luach is a specific subset, so it's probably inaccurate to refer to the Luach as the Metonic calendar.
So, should we continue to charm this user, or decide this is off-topic?