They can tie him up in court and destroy him financially long before the case even makes it to discovery phase. They think they know what they are doing. Lindell has an advantage though because his business the last few months have been booming and that is likely not reflected in his public "profile" so dominion assumes it will take far less money to bankrupt him then it might actually take.

Most people do not understand how the court process works. They might not even spend a single day presenting any evidence. They could spend years litigating how and where to have the trial and other bs like that in order to financially drain Lindell.