Not sure what your concerns are?
For glued segment, the wet joint (and epoxy) should have the same properties as the parent concrete or stronger. In this case once it is cured there is no difference from the parent concrete. These are all well documented as sample tests by the manufacturer would prove that any failure actually occurs in the parent concrete rather that the epoxy.
The shear key for glued segments serves 2 purposes. First is that it serves to “home” in and fit exactly (tight fit) during erection as they are “match” cast. The second is that for erection purposes, especially during balanced cantilever construction it holds the segment through shear transfer of the key the glue (epoxy) cures or attain its strength. The latter is not of a consequence in this case as it is very likely that the epoxy will all be cured before the spans are lowered.
So in the final condition, the shear key is not really required as the strength should come from the epoxy. So in this case it would be like a “secondary” line of defence should the epoxy fail, which is very unlikely. It would be a different case if these were dry joints; then the shear key is required.