If you plead guilty in exchange for them dropping the other counts, then yes that is a plea bargain. There is a possible argument that the State would be collaterally estopped from filing the other counts if you can show that you are somehow prejudiced now based on your reliance on the plea bargain. Maybe some evidence necessary to your defense is gone now since the case was disposed of etc.... Its very fact specific.
But if the other counts are still based on valid law and you don't have an argument for estoppel, and the State still has the evidence they need to prosecute... you could absolutely be recharged on those other counts.
I am pretty sure I know what statute you are talking about that was overturned and, if I'm guessing right, the statute was only only partially overturned and you can still be prosecuted under part of it. If the other counts rely on the section of the statute that is still valid then the State may not just let this go.