Nothing in the official material promises a processing time, and the route proceeds through EB-1 or EB-2 subject to visa availability, which is published in the Visa Bulletin and outside anyone's control. Speed is a claim made by intermediaries rather than a published feature of the framework.
Test the promise against what is actually published
When a route is sold on speed, the first question is where the speed is written down. Here it is not. Vetting has no published duration.
The categories through which successful applicants proceed have their own queues, and those queues depend on the applicant's country of chargeability and are updated monthly rather than guaranteed. Against that, the investor route has its own long timetable and its own two-year conditional stage, so a person comparing them is comparing two uncertain schedules rather than a slow one and a fast one. What is certain is the order of payments here: money moves before the outcome is known, and does not come back.
Marielle should not tie a sale of her charter operation, a lease decision or a family schedule to an assumed date. She should re-check the official terms immediately before any payment, because the terms she is planning against may not be the terms that apply when she acts.