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I think that means metric tons, which gives a much more reasonable payload size of 6400 kg.

It cannot be metric ton, because "mT" is not a SI unit.

It's metric ton, as in one thousand kilograms.

That's to illustrate the difference between an imperial ton, which is 2000 lbs (or ~907kg).

> It's metric ton, as in one thousand kilograms.

Or (unfortunately not) better known as one megagram.

It cannot be 6.4 kilograms, because the launch mass of the average geosynchronous satellite is on the order of 5000 kg, e.g., https://en.wikipedia.org/wiki/NSS-7, https://en.wikipedia.org/wiki/Intelsat_901, http://www.ilslaunch.com/node/4289 (Inmarsat 5-F2).