I would lift the ban if it is only for low quality posts and he has no other accounts with a history of bans.
Sure... so, did you just registered this account to post this? Or are you OP and think we are dumb enough to think you are a different user randomly suggesting a unban for yourself? 
Is it normal to permanently ban someone for low quality posts on the first ban?
I think it's possible if that's all you do. I've seen multiple users these past few weeks that got permanent banned and the only possible (or at least evident) reason was that they were spamming (mainly in bounty threads) and/or writing in a thread to earn a bonus (which is against the rules and will get you perma banned).