May be irrelevant or not, depends. And this is not an argument for or against.
One thing about Tile-Proxy and Google Earth - there is no night time scenery only day time. This is because Google Earth is a nifty program that gives a nicely integrated view but is sourced from a huge database of pictures from all over the world, some public source, some not. Google Earth is not real time imagery so the question then becomes, to what extent was Google Earth an improvement on the FSX stock scenery.
I think the tile proxy program worked ok but there were issues for system load and screen resolutions because of pixel sizes. A good search via the net should help. I think I seriously considered it but decided not to do it because of the night/day issue, in other words Google is just a big data base of pics and is not real time satellite imagery. The other thing is Google earth does not provided down to ground level accuracy in every location because of the limits of the satellite imagery available for that location in other words too high level for low level, in other places it is good down to street level. Once you look at the complexity of Tile Proxy and for me a big issue is internet availability and capacity I figured I would stick with the stock FSX scenery and just add in enhancements. Quite frankly, for most altitudes above 6000 ft you would be pushed to tell the difference after all the mesh for FSX does come from proper satelite data its just textures that are the issue they have to be added in no matter what. I am not sure if Google Earth has mesh data written in for display purposes, I think not, and you need the Mesh data to have a proper 3D view and feel in FSX as a flight simulator. From what I saw of Tile-Proxy and the interface to the Google it was flattened in certain perspectives so just a manipulated image set with no elevation data.
But a few thoughts.