I'm not surprised you're confused - the statement you pasted above doesn't make any sense.
Prior to its release, SCORM 2004 was called SCORM 1.3, but the name "SCORM 1.3" is no longer in official use. Moodle does not provide full support for the SCORM 2004 specification (it's a massive spec and it didn't really get a lot of use.)
There's a good doc that explains the different SCORM versions here:
There are some newer specs around like Xapi and CMI 5 but none of those have been as widely adopted as SCORM 1.2/2004 - In terms of Moodle I see a lot more people moving to H5P than the newer versions of the SCORM spec.
Can you give some more context on who provided this statement?