The "willfully blind" passage that you quote from paragraph 17 is in the "Background Facts" section of the complaint. It does not state the basis for the lawsuit - though it is possible that they are setting up an argument of willful infringement.
Paragraph 22 of 3D Systems' complaint reads as follows:
"Upon information and belief, Formlabs' Form 1 3D ...
The general standard one has to meet for filing any kind of factual assertion with a U.S. District Court is set out in Federal Rule of Civil Procedure 11(b)(3):
(b) Representations to the Court. By presenting to the court a
pleading, written motion, or other paper—whether by signing, filing,
submitting, or later advocating it—an attorney or ...
I don't know about the first question, but the second is no. Calculating a patent term can be complicated, but assuming the maintenance fees were paid, etc., there's no reason it should have expired in 2007.