You are very much mistaken I am afraid.
Those calculations are done sparingly, taking today’s money in consideration. Come 2030s those figures will have increased pro rata, with inflation.
The destroyers and frigates you have to allocate to your battle group is for the battle group. Your naval force proper has its own destroyers and frigates. They may be used for either job. But in terms of numbers you have to have extra for your battlegroup. Otherwise we end up like Brits, who are having to borrow escort vessels from Dutch Navy because they haven’t produced 12 Daring Class destroyers as planned and only have 6 instead.
You don’t produce navalised fighter jets for your land located airforce. Naval airforce is separate. (That is why there is a Rafale Marine and there is a F35-C)
I hope we will have the finance to afford such extravagance.
But just look at our Assault ship. What makes it a power multiplier is the number and variety of helicopters it has. At the moment we don’t have enough helicopters to place on it. Heck! We had to revert to using land forces’ cast off of 40 + year old obsolete attack helicopters. None of our Chinooks are navalised.
It hasn’t got proper protection either. All it has is 2 old pre used phalanx CIWS. It also needs a Tepe destroyer. Why is it lacking all these? Bad planning? Financial constraints? Bad policies?