That guy probably found those from his ***, TF-X is one of the most "real" stealth platform i have seen, same class as F-22 and F-35, now it comes down to material.
And that guy wants to have them integrated in FAL? What's he on?
There will be a different layer applied to that place, in order to cover there, it won't be empty
Other than that there is no problem regarding stealth, bypass layer vent will also get a cover too
Well, lots of subsystems (if not all)are finalized already, some will be in their current form and some will be delivered later as they are an improvement/ newer tech.
CDR will be completed around 2024 and first flight is planned for 18/03/2025, which they say is a "guaranteed date"
Whole...