No. Resignation changes employment circumstances but does not establish the listed profession, qualifications or lawful US work permission.
Assess the opportunity independently
Have the actual US duties and credentials reviewed. Avoid treating a costly personal commitment as evidence that an immigration decision must follow.
TN is available to citizens of Canada and Mexico who have prearranged professional employment in the United States in a profession that USMCA Appendix 2 actually names, and who hold the credential that entry specifies. A TN professional is admitted for a period matching the employment, up to three years, and may seek further periods as long as the work remains prearranged professional employment in the listed occupation and the applicant's intent remains temporary. If the deliverable is survey data, plans, boundary determinations or the professional judgement attached to them, the engagement is professional work within the listed profession and the letter is simply badly drafted. TN requires Canadian or Mexican citizenship, not Canadian permanent residence; a profession listed under USMCA; the exact education, licence, or experience prescribed for that profession; and prearranged professional work. What matters is whether the degree, as awarded, meets the credential requirement of the specific listed profession, which some listings state as a baccalaureate or licenciatura and others state differently. Residence in Canada is a logistical fact rather than an eligibility factor: the underlying criteria of profession match, prearranged employment, and temporary purpose apply the same way regardless of address.