The Twotter (or any STOL aircraft) is prone to being blown badly off course by strong crosswind gusts at low speed just before touchdown, there was a similar accident in Nepal a few months ago.
This is one of the known risks of short landings in STOL aircraft into short narrow strips in unstable weather conditions. There is a short window just before touchdown where there is insufficient time for a go-around and an incident is inevitable if a sudden gust bites you.