The rule are self explanatory so I don't know why you are finding it difficult to comprehend, is just simple when your account is banned all your account that tied to you aren't exempted so they are also ban from the forum even though they don't commit any offense they are automatically ban. Then if you are ban for any reason you are not permitted to go make any other account in this forum if found it would be also be ban automatically for rule violation. So if you own 10 accounts make sure you don't violate any rules with any of them because if 1 account among the 10 is ban is also affects the remaining 9 so treat all with equal rights otherwise your accounts will be ban as well.
from your explanation it means the rule is self contradicting and should be looked into for a rephrase. Because if its not illegal to own multiple accounts then banning all multiple accounts linked to a faulty user should be put in view. The rule can be rephrased to say one account to one user and owning multiple accounts at owners risk. Otherwise this rule is just self contradicting and should be open for review.