I just noticed that the account of a formerly-active user whom I hadn't seen active since he was suspended a while back has been suspended again for a period of one year. He is not even participating on this site anymore so I don't understand the reason for this suspension. Will my account too be closed if I stop participating?
He is not even participating on this site anymore so i don't understand the reason for this suspension.
He was participating, slightly. I can't provide details on the exact reasons for suspension1, but I can tell you that he was suspended for his participation (more accurately, something he did in the course of that participation), not for his lack of it.
Will my account too be closed if i stop participating ?
No. People are free to come and go from the site if they don't break any other rules. We don't suspend accounts for inactivity.
1. Moderators are bound by common decency to not discuss the details behind a suspension of a person who by definition isn't here to defend themselves.
There are no measures in place to suspend registered accounts (with rep>1) that do pause their participation.
So if you wish to be suspended, then flag one of your own questions for a diamond moderator, and ask them (ideally you'd ask politely) to suspend you. There's no need to create extra work for the mods by forcing a suspension through repeatedly breaking the rules.
I saw some of the material that led to the suspension in question. Those comments have been deleted now, as they broke the site rules. That was the reason for the suspension: not inactivity, but rather rule-breaking activity.
The poster has explicitly insisted that he would go on breaking the rules until he was suspended. He's done that on more than one StackExchange site, and that's been his "personal policy" for over a year now, so this wasn't a one-off event in time or in location.
He's now suspended.
To prosper, the site needs enforcement of the rules. This poster wanted to be suspended.
And now, the rules are enforced, and the poster is suspended. So we've all got what we need. If anyone has a problem with the suspension, then they should address their complaints to the poster himself, who actively sought out and engineered the necessity for the suspension.