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No you've got the gist of it: the point is that numbers for CO2 emissions of LNG assume a leak-free supply chain.

That's not possible in practice: LNG leaks at almost every single step, and monitoring of it has been inconsistent and poorly implemented. Add in the significantly higher greenhouse effect of methane in the atmosphere, and you lose essentially all the potential benefits (not to mention the ultimate issue of continuing to add sequestered CO2 back into the atmosphere - it's still a fossil fuel).

Methane leaks. Unburnt methane has a global warming potential 28 times higher than CO2. (This is why landfills will burn methane buildup, even if they aren't using it to generate electricity or capturing it to resell.)

I’d assume they’re talking about methane leaks throughout the supply chain