No. Length of experience and seniority do not establish specialized knowledge. The knowledge must meet the statutory special-or-advanced standard and be tied to the company's products, interests, processes or procedures, but it need not be proprietary, unique or unavailable in the U.S. labour market.
Seniority is a fact about the person; specialized knowledge is a fact about the company
The statutory definition is anchored in the petitioning organization's product, service, research, equipment, techniques, management or interests, or an advanced level of knowledge of its processes and procedures. A developer's long experience with widely available tools is not enough by itself, while special or advanced knowledge of an internal platform may qualify even if it is not proprietary or unique. Hypothetical example: a Sainte-Brigitte-de-Laval senior developer at a fintech firm is proposed on seniority alone; the review instead identifies her deep knowledge of the firm's transaction-reconciliation engine and documents how she acquired it and will use it in the U.S.
assignment. USCIS may consider comparisons with colleagues and whether the knowledge is easily imparted, but it does not require proof that a U.S. worker is unavailable or that only a handful of staff possess the knowledge.