“Talk – Action = Zero” basically means that climbing should be a zero sum game. It you talk the talk you have to back it up with actions to prove it.
In software terms this is like saying you can do all the design and planning you want but unless you can back it up with working software then the “game” doesn’t balance.
Or to quote Ward, who’s far more qualified and succinct
“It’s all talk until the code runs” – Ward Cunningham