pure propaganda.
No vertical tail means controlling it with the wings, it means killing lift, sorry something you can not understand.
the simple intakes are for low speeds,
and the tip changing AoA means killing lift too and stressing the thinnest part of the wing with some buffeting and oscillation.
Perhaps you do not understand for a reason most aircraft have vertical tails.
Is it invisible to radar? no, it is not, more propaganda.
If you have high school physics knowledge you understand all materials will reflect light as well other electromagnetic waves, it is impossible to absorb all frequencies, why?
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Because frequencies are related to electron accelerations and highly related to the orbits they have plus
quantum physics establish energy will be always radiated or reflected because atoms will keep their electrons so they will always reflect some energy, add diffraction you are just peddling propaganda for ignorant people
if your eyes can see the aircraft so radars
