What an incredibly non-environmental and energy wasteful solution. First they make hydrogen using the worst possible solution, gasification of brown or low energy coal, then land transportation of compressed gas. Next it is liquefied and transported 9000 km by ship 75 tonnes at a time. I assume that they are, at least, using boiled off hydrogen as fuel for the ship but maybe they have found a worse solution.

Today brown coal, tomorrow Solar for hydrogen. It is FAR cleaner to gasify coal to make H2 and sequester all the CO2 and the very-highly polluting coal ash underground. Thus, coal gasification can be as green as renewables.

Like so much else some shades of grey.
All the previous comments are 100% true even if seen as somewhat contradictory.
Globally business is not interested in other coloured H2 than green. The only consensus as understood from the many interested and potential international customers is that it must come as 'green H2 and that means certified renewable energy electrolysis. There are many milestones on the path to synchronicity and transport by sea is just one. with this shipment being a worlds first attempt ,the only rationale that could make any sense is as an experimental trial for possible future 'green hydrogen exports.
There is certainly a lot of proposals and preliminary investigation at this stage when the technology direction is very fluid. This first small 75 ton shipment while barely a drop in a bucket is some years away for green H2.
While there are still a few FF company owned politicians - or national economies- and career business lobbyists (esp disappointingly in the U.S.) that still believe in CCS etc.
It is hard to know the true motives behind the choice of the scheduled to close in 2030-2047 heavily polluting brown coal Loy Yang power station site but safe to say some logistics knowledge will result. The site is of course as can be seen was chosen as the .au trial site for geological CCS.

Crucial question:  what powers this boat?  If it's not hydrogen, it seems pointless.  If each shipment delivers less energy than it consumes to make a round trip, it's worse than useless.

I did not see anything about carbon sequestration in the article.

The article suggests that CCS will be used:

to form the CO2-free Hydrogen Energy Supply-chain Technology Research Association (HySTRA).

Back to you.

It would be more efficient to transport the coal to a site near where the hydrogen would be used. Doing this would at least avoid the boil off of the H2 during transport.