I don't, it's just clear there are people here intent on creating fear, uncertainty and doubt for their own gain.
I couldn't care less what people buy as long as they research it themselves and can afford not to go into debt over it.
The guys working on this are a knowledgeable, fun and competitive bunch. I hope once they have something worth showing they'll make an effort to demonstrate it so you can see the team.
Not trying to create FUD, just stating the complete opposite of your opinion. I think when promising to deliver something intended for a data center, having external power supplies is both a shortsighted and moronic decision.
Back in the day Cray used to use liquid nitrogen cooling for the X/YMP or whatever it was called. I have no idea what they do these days.
All YMP and XMP's were air cooled. The YMP was the first to be offered without a water cooling option. To the best of my knowledge no Cray system used LN2 for cooling. Most of their liquid cooled systems used Flourinert. Prior works of Seymour Cray at Control Data were LN2 cooled.