The Basic fares - HBO fares as they also known as - have no exceptions for status - if you want to checked in luggage then your new Gold card isn't going to make a difference, you will still have to pay to check in a bag. Plus fares give you addition space and weight allowances and are usually better value if you definitely have to check in a bag.

The two exceptions are when a flight is full and you may get a text or email message a day before travel saying that the HBO restriction has been removed; also if your bags are within the HBO limits for cabin bags normally speaking you can check in a bag to reduce cabin space pressure so long as that is "instead of" rather than "as well as" cabin baggage. But neither is status related.