No, the TileMapRenderer and scene2d Stage / Actor APIs are different. Tile map APIs do not extend or use scene2d APIs.
You can use both at the same time in one application (for example, to render your game zone using plates and your user interface using script2).
There is a new and improved (as of February 2012) Libgdx Tile Map API: http://code.google.com/p/libgdx/wiki/GraphicsTileMaps , which has an example game that can help clarify things.
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