SizzlingCalamariSizzlingStats doesn't parse log lines/files, it reads data directly from game memory. For non scoreboard stats, it does custom game event handling and tracks the stats manually. At the end of tournament rounds, the stats are formatted and shipped off to the web server.
Oh wut....I though this was a dead giveaway: https://github.com/SizzlingStats/sizzlingplugins/blob/master/sizzlingstats/LogStats.cpp#L148
Guess I was wrong :)