You are correct and the statistic, although numerically insignificant as a percentage of global carbon emissions, is only reasonable as an estimate if (as it says buried in he article) "indirect emissions are takne into account." This presumably means the emissions related to producing the components of the rocket itself, and possibly of transporting all components to an assembly point and the resulting rocket to the launch pad. Once launched, most liquid oxygen plus liquid hydrogen rockets do produce only water vapor, which looks impressively billowy but does not add to carbon emissions. I say this not to defend useless vanity trips to space, but to focus the conversation properly on the probable source of the emisions cited, a calculation I haven't attempted to repeat. The whole thing was made for sensationalist point-making. While that may have some value, it doesn't help compared to pursuing practical ways to reduce carbon emissions made in industrialized countries at much greater scale than this that are, in fact, the problem.