They will be confused as the AI is leading you down the wrong path for what you're looking for. Let me see if I can address your questions directly.
You, the applicant for updating your Special Airworthiness Certificate (including Operating Limitations), use
the applicant side of the Airworthiness Certification portal (hereby referred to as the AWC). This is the path to update your OL's.
In the process of filling out the steps for an Amended Certificate in the AWC, you will provide the details through web forms that will populate an electronic version of an 8130-6. You will also upload a letter to AWC simply asking for your OL's to be updated to the latest version.
It does not matter how old they are or what they say, you will get an entirely new set of OL's based on the current revision's ("L") Appendix D. This will be performed by an inspector assigned by the FSDO chosen when submitting your application in AWC, or via a DAR. The inspector may have additional questions for you in the course of reviewing your request, you can simply produce the evidence required when requested.
Very separately, to your last point around Sport Pilot, I recommend you review the
EAA's resources on the topic, including FAQ's and videos. Your OL's
do not define Sport Pilot privileges or conditions. It is important to understand the differences between the limitations of the
pilot and the
airplane as two separate entities in relation to Sport Pilot and how they apply to your specific situation.