It also does specifically state that they use that to avoid detection (and only between those two people) so they could have been using multiple communication mediums.
That document has a lot of more interesting stuff, however. They also talk about an "apple proprietary metal finishing process" made by a supplier - could they have tried to steal Liquid Metal?
edit: They also state this below which may have some more specifics on what technology is in question:
"Documents sufficient to show hardware development at OpenAI involving (1) bat-
tery technology, including can size, flange specifications, and manufacturing toler-
ances; (2) the metal finishing process, including surface preparation and anodization"
It also does specifically state that they use that to avoid detection (and only between those two people) so they could have been using multiple communication mediums.
That document has a lot of more interesting stuff, however. They also talk about an "apple proprietary metal finishing process" made by a supplier - could they have tried to steal Liquid Metal?
edit: They also state this below which may have some more specifics on what technology is in question:
"Documents sufficient to show hardware development at OpenAI involving (1) bat- tery technology, including can size, flange specifications, and manufacturing toler- ances; (2) the metal finishing process, including surface preparation and anodization"