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Liquid H2 requires cryogenic tanks. The tank will loose heat, so need continuous power to keep it cool. Or there will be H2 leak over time that will empty the tank. When BMW made their hydrogen combustion engine, the tank would get empty within a month of parking turned off.

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The continuous power though is actually quite minuscule in this context. NASA has a lot of test data published, e.g. for their 125 000 liter storage tank, the heat ingress in 24 h is 7.2 kWh while the energy content of the hydrogen in the tank is 290 000 kWh.

What is being proposed for energy storage is signficiantly larger than this, and then the square-cube-law gives even less heat ingress as compared to the energy of the tank contents.

The question is still what’s more efficient and cheaper. If storing a huge amount of liquid hydrogen in a tank and using a % of it to keep it liquid is cheaper than the methanol infrastructure and its multiple conversions, then it will succeed.

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