Without a catalyst (natural or artificial), this reaction is very endothermic, requiring high temperatures (at least 2500 K).
Water oxidation may well be endothermic, however, catalysts can not change that fact. A catalyst can change the activation energy of a reaction (thereby changing rate of reaction), but can't change a reaction's thermodynamics.
Endothermic reactions can be driven forward by coupling them to one or more exothermic reactions. Biological systems do this all the time. But even this does not change the thermodynamics of a reaction, which merely represents the difference in energy between products and reactants.
Endothermic reactions can also be driven forward by adding energy (in the form of heat, for example).
As a random aside, if you search for that sentence on Google, a journal article  appears. It looks like they've copied parts of that wikipedia section verbatim.
It might be as simple as your suggesting and you get to win the argument! Or someone might revert and you lose.