This would be most useful to you if a string of randomly selected plot-related keywords is the inspiration you need. If you want something to flesh out the plot or to tell you what sorts of things would normally go into a plot of one type or another, this isn't enough. It's just random keywords.
This generator gives you a 12x12 table of plot types - 144 entries. Each row is a category: Quest or Adventure, Pursuit or Escape, etc. The 12 columns in each row cover variations on that type, such as Abduct for a Pursuit/Escape plot. The variety seems pretty good.
You choose which kind of dice you want to roll (d100, 2d6, 1d12, 3d6, or 1d20) for the row and column. You roll up entries until you have enough to work with.
Calling it a plot generator is somewhat of a misnomer. Per Wikipedia: "Plot refers to the sequence of events inside a story which affect other events through the principle of cause and effect." There's none of that here - no inciting incidents, no plot points or plot events, no sequencing or cause and effect, etc. There's no discussion of common plot elements for one plot type or another. Instead, you get one or more keywords as random inspiration.
Ken Wickham's generator tables frequently give you a choice of dice combinations for the table, although without explanation about why you might select one over another. Does he assume that some gamers have limited access to dice? Or is it because the tables are carefully designed according to the shifting odds when you change the dice combinations? If it's the latter, the choices seem odd. Quest and pursuit stories are standard fare, right? Depending on your dice selection, that category could have the highest or the lowest probability, compared to other categories. Or consider the Metamorphosis/Transformation row. Depending on your dice type, it's either impossible to select, or one of the two most likely categories, or somewhere in between. The only die type that gives all categories equal weight and that includes all 144 possibilities is 1d12 for the row and the column. In my experience, you're much more likely to find RPGers who don't understand dice probabilities than you are to find RPGers who have only a limited set of dice.
The main thing to keep in mind is how much you expect from a "plot generator." If a few randomly selected plot-related words will inspire you, you're in luck. If you want more, you need something else.