Well, I don't know that. All of the above was just me trying to understand what the heck the back story is. And it looks to me very much as if Sato is being done a disservice. But if you want to judge for yourself, Google on "Katsufumi Sato" and "pterosaur", and sample the journalism available. Sato was presenting at the Biologging Science Symposium. From the meeting description (in the link), it seems fairly probable that he was primarily presenting his albatross telemetry. But as I say I haven't found a transcript.

Googling around, it's interesting to see how many comments this story attracts from people who mention giant dragonflies. But those dragonflies flourished in the Carboniferous, as long before pterosaurs as T. rex is before the present day. From Berner's data, the Carboniferous was a period of high oxygen partial pressure, which persisted until the time of the end-Permian extinction event. That's when the evidence of anoxic oceans and soils begins to appear, suggesting a huge change in atmospheric chemistry. So we can't reasonably cite the existence of giant dragonflies as an example to support better flight performance in pterosaurs: the two groups never co-existed, and they inhabited very different worlds.

Grant Hutchison