I don't know what the KB article talks about but as it suggests you could ask the NetApp Partner or Account Team to figure it out for you.
I say I don't know what the KB is about because the docs say (https://docs.netapp.com/sgws-115/topic/com.netapp.doc.sg-s3/GUID-3266A961-C006-4BFF-8B30-445F4F888718.html?resultof=%22%61%75%64%69%74%22%20%22%6c%6f%...) that SG audit logs are not logged to syslog, but to a separate audit log file. As you can see from the documentation, you can get that log file exported read-only via NFS. The hard part is parsing it without missing any rows (personally I couldn't do it, but if you're good with regexp, you may be able to; or if you can get NetApp Professional Services to do this for you).
As for other (non-audit logs), it seems some may be forwarded to syslog. From my experience with (other NetApp apps) and Docker, it's not hard to forward Docker logs to Syslog and from there to a forwarder and/or SIEM, but you'd have to make changes to the OVA file (or possibly StorageGRID appliance configuration) after upgrades. Since these aren't documented, they aren't supported w/o FPVR request by NetApp partner or account team, so you'd still need to get this request done and approved to get the correct instructions and risk-free reapply it after upgrades.