No. The requirement is specialized knowledge of the company's own product, process or procedures, or an advanced level of knowledge of its processes, distinguished from skill that is generally available in the industry. Length of service alone does not establish it.
Experience is how it was acquired, not what it is
Hypothetical example: the file opens by saying the specialist has been with the company since it started and knows the equipment better than anyone. A reviewer will ask what, specifically, he knows. The answer has to be items: this company's control sequences, its commissioning order, its fault library, its documented deviations from manufacturer defaults.
Those are properties of the organisation. Twenty years is the explanation for how he came to hold them, which supports the requirement that the knowledge was acquired through employment with the company, but it does not substitute for describing them. The rest of the framework still applies: one continuous year of qualifying employment abroad within the preceding three years, a qualifying relationship between two operating entities, an assignment that is not labour for hire, and a five-year ceiling on time in this status.