No. After having that exact question in a tourney game, the answer was resolved fully in a kibbitz by Antoine.:
2007-09-30 Antoine Fourrière Verified as Antoine Fourrière
When trying to understand the code Fergus wrote for the not-functioning automated preset for his own game, you can read in the Post-move fields
die You may not capture or fuse with a piece on a fission move.;
This lead to the quick creation of the 'Fluid' mutator, which allows that.