The question is pretty straightforward. Although this is Florida, a check of the statute you cited relates to whether adjudication of an offense is withheld. The question you are being asked is asking not just whether you have ever been convicted (adjudication), but whether you ever plead guilty or no contest to a felony. If you plead guilty or no contest then the answer is yes, regardless of whether or not adjudication was withheld.
This is not to be considered legal advice nor does an attorney-client relationship exist.