I don't think this lawsuit will go anywhere. The lawsuit is a defamation lawsuit, which is notoriously difficult to prove, as you have to prove that the statements were knowingly false (not made as an opinion) and made with purpose to damage you.

In this case, from what I can see, the claims were largely true. You can't successfully sue for defamation of statements that are just true. Then, even if there are claims that aren't true, you have to prove the untrue statement wasn't an opinion and that it was made with the intent to say an untrue thing as if were fact in order to damage you.

EDIT: A poster below pointed out that you to make claims statements that you knew were false; there is also standing if you didn't know they were false but you didn't confirm if they were true in a manner deemed as "reckless" by the court. I believe this is a lesser burden than I described above, but still a very high bar.