false.
It all depends on Ephialtes' testimony; it's an assumption. Using his specific testimony by itself is an assumption and needs to be pieced together with many other things to make a strong case.
Here's how to construct a case against Hammereditor:
1) Ephialtes' testified against Hammereditor/Pacnet by saying the attack came from their IP.
2) Hammereditor's story is oddly inconsistent
etc...
One of those alone does not say anything.