Not by itself. The knowledge must be the company's own product, process or procedure and must be distinguishable from what an experienced dispatcher in the general market knows. Being irreplaceable is a business fact, not a legal test.
Scarcity inside the company is not the standard
The statute defines specialized knowledge as special knowledge of the petitioning organization's product, service, research, equipment, techniques, management or other interests and its application in international markets, or an advanced level of knowledge of the organization's processes and procedures. USCIS looks for evidence that the knowledge is not commonly held in the industry and that it took significant training or experience within the company to acquire. A dispatch and route-costing process that the company developed itself, that integrates its proprietary driver-pay rules and that the affiliate cannot buy from a vendor can meet that description. The petition should explain what the specialist knows that a dispatcher hired locally in the United States would not, how long it would take to train a replacement and why the affiliate needs that knowledge now. Ask the company to write that comparison honestly before counsel drafts the support letter.
Hypothetical example: an aquaculture-feed producer wants to send the employee who developed its nutrient-mixing controls to a related U.S. plant. The first review should identify the specific internal knowledge, who else has it, how it was gained and why the U.S. task needs it. Payroll and personnel records must separately prove one continuous qualifying year abroad during the preceding three years. A patent is not essential, but an unsupported assertion that the employee is uniquely talented is weak. Finally, count prior L admissions because the L-1B total is capped at five years.