Capt. Bloggs has it in one.
The runway should have been changed to 12. At the time the Stearman landed, a cross-tailwind from about 240 sprung up to >5kt. Look carefully as many observers have already at the component shown in the video.
My take is that the pilot decided to take the taxiway too early and was caught by a gust at the same time!
G'day
