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This is the most human element. dioguitar23 was a well-known uploader/release group handle in certain forums (e.g., PlanetaAdult, FilePorn). Scene groups or individual rippers often embedded their name as a badge of quality and to prevent leeching without credit. The guitar reference suggests a Brazilian or Portuguese-speaking user—common in early 2010s adult content sharing circles.

Unlocking the Mystery: What is "carib 081711 781 hd dioguitar23 upd"?

This is a "ripper" or uploader tag. Dioguitar23 was a prolific uploader on file-sharing forums and torrent sites during the early 2010s.

: The inclusion of what seems to be a date and version number ("081711" and "781") along with "upd" suggests a system for tracking updates or different versions of content.