The explanation that this map can illustrate the views of Venizelos or any other Greek makes no sense to me. You can illustrate his views making a map which shows proposed Greek borders according Venizelos' claims at different time. The demographic maps should be supported with at least some evidence and there is no evidence that the Greeks were such as majority in Thrace as shown in that particular map. I have pointed sources according to the census in Eastern Rumelia, according to Erickson and suggested to search for the election of the first Ottoman national assembly of 1908. 
That is as if let's say that Bulgaria currently claims that 2,000,000 Greeks in northern Greeks are Bulgarians. Does it mean that in the demographic article of Greece we should also include a map which shows those people as Bulgarians in order to illustrate the Bulgarian view? That would make no sense since according to the census those people say they are Greeks. (That is just example, a ridiculous one) 
So if you want to illustrate Greek position make a map showing Greece in its proposed borders but do not use maps which are obviously wrong as that particular one. I repeat, the other demographic maps are also disputable but at least can be supported with some evidence.