When Model Builder validation hangs me up like this, I've found the easiest work around is to run the tool inside a Calculate Value tool to get around Model Builder's validation preconditions.
The basic procedure is to create a Python function that runs the tool and returns the output, assigning the output to the data type the tool creates.
Having the same problem here. I tried several different work-arounds, including using the Select Data tool. Eventually I settled for running the Create Geometric Network tool in Batch mode.
Here is a related post: How to execute my model complete with one run? Geometric Network does not work correctly.
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