This sounds very much like the Africa-1 cable project that failed to get funded a few years ago.
While the aim of landing in every country and island is very laudable, the economics don't support this type of business model. Any additional landing will add around $20m (perhaps more) to the capital cost of a submarine cable project. It will also increase the annual operations and maintenance costs of the system by perhaps $0.3m-$0.4m per year.
If the additional country or island cannot generate the traffic, or more importantly, revenue to sustain those costs then the financial burden of the additional landing will be carried by the other users of the system. This runs counter to the objective, which everyone supports, of lower bandwidth costs.
While I wish 5-P and their partners every success, I would have been more convinced if they had announced they were doing a proper feasibility study as well as signing MOUs. I suspect that if this project does go ahead they will need to reduce the number of landings to make the business case add up.
Dave