No, failure to sell the entire stock if requested

No, failure to sell the entire stock if requested would be a serious mistake. Cytodyn is a non-revenue, or pre-revenue company. The goal is to become a revenue company, before running out of money. You don't turn down your first order. You set your price, ask them how much they want, and give them everything they ask. Not only is your own solvency on the line if you fail to sell it all (what lender will give you the next loan if you pass up a paying customer, your first customer?), but also your credibility as a supplier is on the line. Go through all that to be the first approval of your product, and you refuse to sell available supply, that does not look good to other countries, such as the UK or Canada. Why should they bother if you don't give them available supplies?
And, finally, if you did sell all, imagine other governments hearing that CytoDyn's stock was entirely sold out to the Philippines, a country many consider poor, whether or not that is true. That may cause the other governments to line up for the second batch. And, importantly, the first current batch is not the last. More is coming. Sell everything if the customer wants it.