No. The outcome depends on the required submissions, vetting, eligibility, admissibility and visa availability, and general processing language on the official site is not a commitment to an individual applicant. The handover should be planned on the manager's current status and reviewed as milestones are actually reached.
Keeping operations conditional
The plant needs a manager on a date; the framework offers a sequence of steps whose durations the company does not control. The sensible plan gives the manager a lawful basis to work in the plant now, which for a qualifying transferee is an L-1A petition, and treats any permanent-residence process, Gold Card or otherwise, as a parallel track that does not set the operational calendar. Record what the company would do if vetting takes longer than hoped or if further instructions require documents that take months to obtain.
Do not sell the manager's house in Saint-Augustin-de-Desmaures, enrol children in a U.S. school or announce a permanent appointment on the strength of a payment made. Reread the official instructions before each step, since the framework is described in a dated source and its terms can change between the day the company decides and the day it pays, and keep copies of every submission and every communication received.