For chess to be called "solved" you would need to have a winning strategy for every winnable position. The same is true for Starcraft.

What this person provides is a (very non-optimal) algorithm to build anything within the tech tree of starcraft, but building is just one part of the game, and the only easily pannifiable one.

You can plan buildings, training & simple orders (go harvest crystal). You definitely cannot plan all the micro that any fight will involve.