That the current official terms say what he has been told they say, that his sponsor's obligations are in writing, and that he can meet the requirements of the EB-1 or EB-2 category through which successful applicants proceed. Payment establishes none of those.
Payment is a step in the process, not proof of eligibility
The framework described in the official material has an order: a nonrefundable processing fee, vetting, and then a gift to the U.S. government after successful vetting, with successful applicants proceeding through EB-1 or EB-2 subject to category eligibility, admissibility and visa availability. Each stage depends on the one before, and none of them converts money into status.
For Viktor that means the underlying category matters as much as the arrangement. EB-1 and EB-2 carry their own substantive requirements, and a machine-shop owner should have an assessment of whether he plausibly meets one of them before any commitment is made. Admissibility is a separate question again, decided on its own grounds.
A dated record of what the official page said, and a written statement of what the sponsoring company will do, are the two documents that make the rest of the analysis possible.