Do not assume prior US residence is required. Identify the actual process available for the applicant’s location and circumstances.
Avoid inventing a move prerequisite
A proposal from abroad should be reviewed on its own terms. Payment does not by itself make adjustment available or grant US residence.
The official description sets out a process in which the applicant submits an application with a processing fee, undergoes vetting, and makes the gift, after which eligible applicants receive permanent residence through an employment-based category subject to visa availability. A useful first meeting compares the household's facts with what the program actually requires: eligibility for lawful permanent residence, admissibility, and an available visa, with a determination under EB-1 or EB-2. Establish first whether you satisfy the requirements the official process sets, including any underlying immigrant category basis it relies upon, and whether anything in your history — a prior refusal, an overstay, a criminal matter — would be an obstacle under general admissibility law. Because the published terms have been revised since the process was announced, any figure, family term or eligibility statement should be re-checked immediately before a decision and the date of that check recorded. The gift is treated as evidence relevant to the specified category basis, but the applicant still must be eligible for lawful permanent residence, admissible, and have a visa available; approval is not guaranteed.