Note that the ingredient list in that table is not complete. To get to pH10.4 there needs to be e.g. carbonate added to the mix. Possibly other ingredients are also missing (eg trace amounts of KI).
The patent does say what other components are in the developer other than the key components listed in the table. It's a good read for the interested.
"The color developing composition can also includes one or more buffering agents to provide or maintain desired alkaline pH. These buffering agents preferably have a pKa of from 9 to 13 and include, but are not limited to carbonates, borates, tetraborates, glycine salts, leucine salts, valine salts, proline salts, triethanolamine, diethanolamine, phosphates, hydroxybenzoates and other buffer known in the art for this purpose. Alkali metal carbonates (such as sodium carbonate, sodium bicarbonate and potassium carbonate) are preferred. Mixtures of buffering agents can be used if desired"
"Various metal ion sequestering agents can also be used in the color developing compositions to minimize the adverse effects of metal ions."
"The color developing composition can also include one or more of a variety of other addenda commonly used in photographic color developing compositions. Such addenda include alkali metal halides (such as potassium chloride, potassium bromide, sodium bromide and sodium iodide), auxiliary co-developing agents (such as phenidone type compounds particularly for black and white developing compositions), antifoggants, development accelerators, wetting agents, fragrances, stain reducing agents, surfactants, defoaming agents, water-soluble polymers (such as sulfonated polystyrene) and water-soluble or water-dispersible color dye forming couplers, as would be readily understood by one skilled in the art [see for example, the Research Disclosure publications noted above]. The amounts of such additives would be well known to a skilled artisan in view of their usual concentrations in working strength compositions."