Yep!
I can add to this. The reason why maxing this card out helps is because Cap1 mostly or never reports credit limits. No credit limit posted doesn't help your UTL. After you max out the card the high balance is recorded on your credit report and then excepted as credit limit. So when you use other credit cards they can take advantage of the total UTL of all available credit effecting your score or I should say hurting your score. You do not have to max out cards that report credit limits. This is an issue with Cap1 cards.
But I wonder... Does a dormant card (card with no activity for longer than 12 months) still have it's credit line counted?