Does the wording make it clear that the part after the "Then,.." applies anyway and not only when you turn the token over?
Yes, it does.
UPDATE TO MY ENTRY:
Updated to invert effects. I put Village on turn over and Smithy when tokens status match.
This way:
- When at the start of your turn your token and the token of the player to your right match: If you do nothing, Janus is a Smithy. If you flip the token, Janus is a Village. If you play one as a Village, the second you play could be both, Village+Smithy. The next would be only a Village or only a Smithy again.
- When at the start of your turn tokens don't match: If you do nothing, its a Ruined Library, but there's no reason to do nothing, as you may flip the token over for it be a Village+Smithy. The next you play would be only a Village or only a Smithy.
The combined effect of each two Janus played when the first of them is not played as Smithy, is 2 Villages + Smithy or Village + 2 Smithies. If first is played as Smithy, there's no way to activate both effects in the next playing, so combined effect would be 2 Smithies or Village + Smithy.
The best situation at the start of the turn is when tokens don't match, so you can change the satus of your token at the end of your turn to make tokens match and leave to your opponent the worst situation for them. On the other hand, if you have reasons to believe the player to your right won't play Janus on their turn, it's better for you to make tokens unmatch.
Feedbacks are always welcome!