Spot is Shippagan in New Brunswick, a popular kiting destination. We just didn't get the strong winds we expected so foiling is the only way to go.
In very low winds, I find line length to be more important than kite size. I was on a 12m kite but it could've been done on a 10m kite easily. The key is to have a kite that doesn't stall easily and everything perfectly tuned...and a dry kite!
It seems in this case there was a layer of stronger wind higher up as there was next to zero wind at ground level. Longer lines also help in developing a much stronger power stroke to get up and going. We tried 50M lines in Perth (pictured below) and the wind was about 5-6 knots, we couldn't get going on standard 24m lines but 50m lines was no problem at all. Just don't drop it!