Correct, but that is not the maximum power transfer condition: you can lower the resistance down to about 1 kOhm and still getting a meaningful voltage.
Yes. That is what they say in their paper and presentations. This particular photo shows a LEC being run with 10 M Ohm resistance. This photo is what they had in hand when I asked for something to add to the slide. I needed something that day because Ruby wanted me to finish up.