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The boat used to consume 100 liters of diesel daily, which is equivalent to 1000 kWh in energy (10 kWh per liter). But after electrification they claim only 150-200 kWh usage per day. This doesn't add up. Were the diesel engines idling all day even when the boat was not moving?

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It seems ok to me, EVs have about 13kWh/100km efficiency while an older gasoline car would consume 10l/100km. And yes, it's quite plausible that the engine was running during loading and unloading

You are right. I forgot to account for the fact combustion engines have a terrible thermal efficiency: about 20%, which gives the boat only 2 kWh per liter of diesel, meaning it was using 200 kWh daily, more in line with the electrical version.

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