@tertioptus I don't understand your objections fully-- I point out that British colonials outlawed Kalari's practice (large groups of fit, trained, martial arts practitioners are generally bad for occupying armies), a very deliberate erasure/removal of history/identity-- more than erosion.
It's also easy to see that kalri is currently being taught/practiced in a variety of formats, not "just choreography," at least not anymore "choreographed" than any other martial arts practice that incorporate weapon training.
I can't speak to the historical citations of Kalaripayattu's age, but as someone who has practiced a number of different martial arts throughout their life, the kalari I've practiced shares footwork w/ muy thai and southern kung fu, dynamic mobility/breathework of yoga/taichi/qigong, and a demanding level of physical conditioning. Most martial arts are bodybuilding systems whose values are expressed through exercise so YMMV.
On top of that, there are unique elements of kalari like the Urumi, a flexible sword wielded like a whip with some multi-prong variations. I don't know what parts of my OP you think are "propaganda" but there's plenty of actual benefit to kalari's practice and much to be interested in (whether to sort fact/fiction) its history.