Here is a blog post prepared for this specific software version:
The string identifies a specific digital version of the hit Nintendo Switch racer, where 0100152000022800 is the Title ID and v983040 corresponds to Update Version 15.0.0 (or later) in Nintendo's internal versioning. Mario Kart 8 Deluxe [0100152000022800][v983040]...
Since its release in 2017, Mario Kart 8 Deluxe has remained the undisputed king of party racers. But for the tech-savvy players noticing strings like in their system logs, there is more going on under the hood than just red shells and banana peels. What is Version v983040? Here is a blog post prepared for this
: Access to 8 additional DLC characters like Link (Champion’s Tunic), Birdo, and Petey Piranha. What is Version v983040
: Patch 3.0.4 and beyond focused on "general fixes," including a specific fix for the jumping "notes" in 3DS Music Park during Time Trials.