The usage of_satellite.data in DTM tends focus around the_satellite.data.customVarsobject. This object was never intended to be accessed directly, but the system allowed it, so people did it.
Remedies:
If your DTM implementation set data elements in code by setting keys directly on the _satellite.data.customVarsobject, you can replace those calls with_satellite.setVar(<data element name>, <data element value>).
If your DTM implementation accessed values directly from within the_satellite.data.customVarsobject, _satellite.getVar(<data element name>) can be used instead.
Below is an example in code.
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//Crusty old stuff in DTM
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var checkoutStage = _satellite.data.customVars.checkoutStage;
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​
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//Shiny new stuff in Launch
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var checkoutStage = _satellite.getVar("checkoutStage");