Toyota have more sense than trying in vain to make Diesel engines reliable and durable whilst meeting the increasingly ludicrous EU (which we never really left in any meaningful way) controls, Hino pulled back from Europe too despite being popular across the rest of the world which appreciates reliable tough simple trucks.
Other parts of the world are growing economically because, well basically they have cheap energy without which you can't have a manufacturing base as Germany is currently discovering, Toyota/Hino can sell as many industrial Diesel vehicles (incl 4x4s with proper engines) as they can make elsewhere do they really need the hassle of trying to please a western europe intent on self destruction.
Toyota it must be noted still haven't followed the other makers down the cul-de-sac of chucking out ICE based vehicles to please some weirdo here today gone tomorrow politicians, they've been criticised for this by the usual suspects but IMHO are likely to come out the other end of this vehicle power experiment as winners.
Their hybrid systems are the dog danglers, proved time after time to be reliable and durable.
It will be interesting to see if we still have the same national self destruct policies in place by the time Trump's 4 year turnaround of the US is complete.