No. The affiliation alone does not establish eligibility. The proposed U.S. work must qualify under a listed TN profession, and you must meet its credential requirements, citizenship requirement, and temporary-entry conditions. Treat the affiliate offer as evidence of the proposed arrangement, not as a separate TN category.
Separate the company story from the professional case
Ask two different questions: why is the group moving this employee, and why does this U.S. position require the claimed professional? The first may explain commercial motivation; the second addresses the TN analysis.
A hypothetical promotion that changes a professional role into general business management needs fresh assessment even if the employer describes it as a transfer. Have the receiving manager confirm the complete duties before selecting a category. Separate the company's account of the move from the professional case that has to be made, since the first is usually well developed and the second frequently has not been examined at all.
The organization will explain the transfer in its own terms — an internal opportunity, a group requirement, a career step — and none of that speaks to the requirements. Return to the position itself: what is the work, which listed profession does it fall within, what credential does that profession require, and does the individual hold it. Establish that the employment is prearranged with an identified U.S.
employer, and that self-employment is not part of the arrangement. Where the affiliate's own team has never considered these questions because the move looked internal, raise them explicitly rather than assuming somebody further along the process will.