No. The real resulting facts and all category conditions require assessment. A transaction cost does not guarantee a favorable decision.
Avoid a paper-only assumption
Changing a label without changing actual control does not settle the issue.
Government charges for this category are modest compared with the categories that require petitions, but the exact amounts depend on whether the request is made at a port of entry or through an employer petition, and they are revised from time to time. Avoid ordering credential evaluations, translations, or employer letters tailored to a TN filing until citizenship eligibility is confirmed, since none of that preparation applies if the applicant does not hold qualifying citizenship. Applying as a Canadian citizen at a land border or preclearance point costs comparatively little at the moment of decision, and an employer petition adds the USCIS filing fee, plus premium processing where speed is being bought. A corrected letter and a registry extract are ordinary administrative costs; a genuine change of employing entity may require a fresh request, and possibly a Form I-129 petition, with its own government charges and preparation time.