The bank hasn't announced the compliance plans so it is hard to say what will happen.
However, on a personal interpretation the BNM announcement did say that CL will be based on your income. I doubt so the bank consider your income to be above RM36K as the invitation is purely from a customer retention/marketing point of view. Likely the bank won't take away your card but instead lower your CL to the compliance level.

In worse case scenario, they'll just maintain you at the Gold level card since that is where you started.
The BNM announcement did not mention about the impact to the type of card that a cardholder will be subjected to in the compliance plan. And banks generally while they have an official information on what the eligibility level for a particular card product, it is pretty much up to them when it comes to granting the card to their customer.