No. Translating a Canadian employment letter makes it readable; it does not authorize work from the United States in TD status. The TD employment restriction also covers remote work performed there.
Preserve the distinction between an employer’s consent and immigration permission
The letter may confirm a Canadian position or permission to work away from the office. Translate those statements accurately without changing them into a claim that U.S. work is authorized. Identify the actual location from which the spouse would provide services and obtain an assessment of any separate work basis being considered. TD accompaniment is for a qualifying spouse or unmarried child under 21 and provides no employment authorization to either. Attach the genuine relationship and status documents for that purpose; a translated employer letter cannot substitute for them or turn an employer-approved arrangement into immigration eligibility.
A dependent in TD status who wants to volunteer, take an unpaid internship, or help at a family business often assumes that no paycheque means no permission is needed. Age and marital status matter individually, so a child approaching twenty-one changes the planning horizon for that child regardless of the parents' arrangements.