To be more clear, this stage is about the technical legal aspects of the complaint, not the substance. That comes next.So, did not the complaint state that on successful completion of the 1MW customer test that the $89 million was due? So failure of the test could be supported in many ways
The court will first decide if the complaint is technically correct, then they will proceed to decide on its content based on further argument and evidences provided by the litigants. You are discussing content and substance, vice legality.
Think of it this way: They must first establish that the complaint is legally valid, and targets the right folks for the right things. Then, they will look at the content, and decide who is right or wrong. We are not yet at the right or wrong on content yet, first the complaint must be established as legally valid. To this end, IH did way more homework than Rossiclown, and have painted a strong picture that the complaints are bogus. Now, Rossiclown gets a chance to amend the complaint and fix errors (if he can) that IH pointed out (like who can be sued, he is arguing against his own agreement, there was no harm, etc.). If he can not fix the errors pointed out by IH to the court's satisfaction, then those errors will be dismissed. What remains, can then proceed to litigation.
So to summarize the process will more or less look like this:
Complaint (Rossiclown) - this states claimed injuries, why, and who did it, and damages sought.
Summons (Court to IH & Co.) - notice to defendants that Complaint has been filed
Motions (IH or Rossiclown) - Motion to Dismiss from IH arguing complaint does not contain any/all injuries, why, who and is thus baseless. Rossiclown could Motion for Summary Judgement where he argues that IH agrees with presented Complaint arguments, and thus no trial is needed (not likely, as IH has not answered yet, nor will they agree enough). Motions can also include time/procedural content, as we have already seen in this case.
Answer (IH & Co.) - this is where IH says I agree/don't agree with items in complaint and why
Discovery - (IH & Co., Rossiclown) - both sides show their cards and present supporting evidence and documents to the court for consideration. This is where we get to see the goods from everyone, unless it is requested to be protected from public disclosure. I suspect Rossiclown may try to play this game, but IH will want it all public. Presented 'cards' to be played in court can be contested by the opposing side and subsequently barred from use in the trial if argued effectively and the court buys it.
Trial (Rossiclown, IH & Co.) - here both sides sequentially present their cards to the court (judge or jury), and make their arguments.
Judgement - (Court) - the determination is made and presented. Normally, if the complaint is defeated, the participants will walk away, however, it can be that the court finds malicious intent on the part of the plaintiff, and bads things can happen from that. If the complaint (or parts of it) is upheld, then damages will be awarded accordingly.
IH has several avenues to go back at Rossiclown, this includes Intentional Tort complaint(s), or pressing for criminal proceedings.