Toyota is also investing in a hydrogen combustion engine which will be able to fit with some of its long standing ICE component suppliers.
Someone at Toyota is in love with this technology, but everyone else in the world knows it is a dead duck. They are selling only a handful each year, and the numbers are going down. They sold 2,094 in the U.S. in 2022. There is no chance this technology will survive. Even hybrids and plug in hybrids are obsolescent and will not be around for long. The market for any large scale technology can only support two standards. Electric cars and gasoline cars make it impossible for a third standard. Keeping inventory and training mechanics is too much of a burden on the manufacturers and distributers.
It would cost billions of dollars to keep this on life support. Toyota is not going to spend that kind of money to keep long standing ICE suppliers alive. They might as well just hand them each $200 million.
Japanese institutions have a bad habit of keeping dead technology on life support, but they can only go so far. They had a nuclear powered ship, the Mutsu, tied up to a dock for decades until 1995. They finally removed the reactor, decontaminated it, and renamed it Mirai as oceanographic explorer. I am sure it would have been far cheaper to build a new ship from scratch, but they did not want to admit it was a waste. ("Mirai" means "future" but in the case of the car and the ship it should be "the dead past.") Then there was the Monju breeder reactor. One of the most expensive technical fiascos in history.