Is the saving account FDIC insured?

I think you should be asking Goldman Sachs Bank, USA

"Savings accounts are provided by Goldman Sachs Bank USA, Salt Lake City Branch. Member FDIC. Savings is available to Apple Card Owners and Co-Owners, subject to eligibility requirements." ---> Apple Card’s new high-yield Savings account is now available, offering a 4.15 percent APY - Apple

Yes. It’s is FDIC insured up to $250,000 (the max amount you can have in it).

I suggest that you contact Apple Support about that matter, using this link:--> Contact Apple for support and service or contact Goldman Sachs Bank USA.

Thanks and regards

Giulio