Initially I thought the same, but looks like it's only a web application, not the software you'd ship with the node.
"Build IoT applications that run on edge devices..."
The moment I see "runs on Raspberry Pi", I know they haven't done any thinking about low cost or low power consumption edge nodes. Get back to me when it can run on a CortexM0 with 128KiB of flash.
Now, we will likely end up doing a whole lot less functionality on an M0 profile, compared to a typical Flogo flow app on an IoT gateway, but the idea is to offload the right level & kind of edge compute onto lower power nodes.
One point worth mentioning is that pretty much any framework can run on a Pi, but running dozens of these Edge apps - "12-factor" style[1], that is where Flogo's advantage shines through.