That would be what the big abandoned tag at the top means, yes.
Dev did suffer from depression but he also got a new job and moved around a bit. I think it's a lot fo things not just one in particular.
It was mainly the depression that caused him to abandon Ethan's Legacy. The messages that popped up on Reddit said as much. There were a few other things like the game turning into something he didn't like, that's what made him restart.
I don't know the full story as to why he's dropped off the grid again, i'm not hovering around the same circles I did back then where all the juicy gossip was but I have managed to gather that he got really busy with his personal life.
Whether or not he will add to this I don't know. He has said it will get updated in his time and he isn't claiming any money nor has any intention too so it could take a few years or it could be dropped altogether.
It's a damn shame if it is, he's got talent, but we can't force him to work .... according to what i've studied up on there are certain "laws" preventing me from kidnapping him and making him work. Sucks really.