It can be, if the settings and method are genuinely the company's own and not the equipment maker's standard configuration, and if the technician's knowledge of them is advanced relative to what the industry generally holds.
Ask whether a competitor's technician could do it after reading the manual
Specialized knowledge is knowledge of the petitioner's product, service, research, equipment, techniques or management that is special or advanced, and the test is comparative: how does this knowledge differ from what is generally found in the industry and inside the company? If the filtration settings are the manufacturer's published defaults, then any technician trained by the manufacturer has the same knowledge and the case fails. If the company altered the line, developed its own sequence of steps to protect flavour or yield, and documented that method only internally, the knowledge belongs to the company.
The technician then qualifies if he actually holds that knowledge at an advanced level, which is shown by his history of implementing and troubleshooting the method, not by his job title. Be candid about where the process is ordinary; a file that overstates novelty is easy to test and hard to repair.