You are right, the creation of multiple accounts isn't against the rules.
Assuming what Ankit Sharma said is true
You create multiple account to bypass the bans which is surely not allowed.
then you are actually doing exactly what answer you linked to said not to do
As long as there won't be any illegal behaviour, I believe you can. I see no problems with it.
But don't just take the word of a 0 scoring answer, also take Jeff Atwood's answer as well.
It is not a problem to have multiple accounts, as long as they aren't voting for each other and doing other sockpuppet-y things.
Though it is generally discouraged, as what legitimate reason would you need for multiple accounts? Idle hands are the devil's playground, etc etc.
Also indicated on the Stack Overflow Meta answer on question/answer bans
Can I simply create a new account?
Yes, but doing so violates the rules for operating multiple accounts - namely, it allows you to do something you would otherwise be restricted from doing. Penalties for violating this restriction can vary:
- Your accounts may be deleted without warning.
- You and others on your network may find your questions are shown to fewer potential answerers or subjected to preemptive review when posted.
- You and others on your network may be prevented from asking questions entirely.
- If you opt to delete your account and then later return to the site, your ability to ask questions may be limited to one question per week until you have demonstrated an ability to ask useful questions.
As such, assuming Ankit Sharma is correct your other accounts were found to be circumventing a question ban on your original account. If you wish to remove the ban read the Stack Overflow Meta answer in how you can get out of it. While talking about spamming, please explain questions on the main site and abusing people will just make the situation worse and as indicated by the Meta, you can be blocked from asking questions at all.