No. The letter can describe private support but does not establish immigration eligibility or a favorable decision.
Identify its limited purpose
Distinguish the employer’s promise from actual official case instructions and outcomes.
Everything the official process describes apart from the payment: government vetting, admissibility to the United States, eligibility under the employment-based classification the program uses, and visa availability. The executive order and program materials describe a mechanism in which a gift to the U.S. government is treated as relevant to eligibility under existing immigrant provisions, subject to the determinations the government makes. A joining spouse is assessed as part of the same initial application and must independently satisfy admissibility and eligibility for lawful permanent residence; the principal's approval does not cover a spouse who is inadmissible. Executive Order 14351 directs the agencies to treat the qualifying gift as evidence of EB-1 extraordinary-ability eligibility or of EB-2 exceptional business ability, national benefit and a national-interest waiver. Start with the current official program terms and write down which facts the applicant must supply, which screening stage remains, and which eligibility pathway is actually described. Under the official framework, the gift made after successful vetting is treated as evidence for the specified EB-1 or EB-2 basis, while lawful-permanent-residence eligibility, admissibility and visa availability still apply.