Yes, kanthari is an Authorized Training Centre by Bharat Sevak Samaj (BSS, TVPM/168), national development agency, promoted by Government of India.
You can find the course on the official website of BSS
Scroll down to number:
159 – Braille Without Borders -Kanthari Leadership Training Centre – Vellayani, Thiruvananthapuram(Dt) – 27-08-2021