I was wondering when you would discover the lying. Here's what is going on w/him. He's depressed and in his depressed mind, he thinks he's logging into the computer more than he actually is. He doesn't realize that he's losing time. Sure, you saw glimpses of the old h when he was home...but that doesn't mean he's not depressed. They wear masks around certain people and it takes a lot of energy to put on that happy face and/or to deal w/people in general when depressed.
Is he lying? Yes and no. Again, I don't think he's got the life of riley going on right now. I think he's got some issues w/depression.
Let me ask you this....have you been really really busy and thought you had done something and later realized you hadn't? This may be what is going on w/him.
I'm not making excuses for his behavior, but I've seen this happen to others while depressed. They become forgetful, their minds become mush and yes, they lie to cover up their odd behavior.
As for living there because of the suppliers, that is just an excuse...but it is also his escape route for not being around a lot of people who know and love him. They find excuses and sometimes those excuses are just that...excuses.
I would watch the business end of things very closely to ensure that things run smoothly at your office and if you need to call him on his bs about the business, do so. As for what he's doing otherwise...continue has you have been w/little or no contact.
What he's doing is very normal for someone in MLC.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.