Oh god now we can have doubts about a doubters tools to prove numbers... and the plot thickens..
No, not really. The page itself says how the chart is constructed if you'd take the time to actually read.
As much as you'd love to be throwing some shade on the math, you still utterly fail to show the 'Unknown' figure is increasing sufficiently with the raised hashrate you mention.
Scrypt.cc has sold at least 500GH/s of Scrypt mining. This means 500GH has to be present in the Scrypt coin networks that is not accounted for by known pools.
The estimation for the pool numbers at any given time of the day is never going to allow that 500GH to fit anywhere.