The money that I.H. referred to, that was used for the research in the paper I linked to, came from the Japanese government. From NEDO, as I recall. It came after years of negotiation. It was described in many official documents that are on line. It was not sponsored by Nissan. It was not $30 million, either, although this was only one program in a larger energy-related grant. The total might have been $30 million.
The Takahashi group collaboration, was funded by NEDO as you say: January 2018 Nikkei article about cold fusion
NEDO is a government program also: https://en.wikipedia.org/wiki/…_Development_Organization