Not a lawyer, but I think it should be pretty straightforward to prove that Stratasys is selectively /inequitably enforcing the patent given the prevalence of PEI build plates and automatic leveling, among other things, long before Bambu released a machine or became popular.
Ah, I forget sometimes that common sense and reasoning isn’t worth shit in a country where people are second-class citizens behind business entities. I can’t even imagine what decent labor and consumer protections look like, let alone fair and responsible IP governance.