[NN99]

As for the attainment of Thai Ajahns, yes as for my knowledge two of them declare in the public. They even gave real details on how they travel on this path.

If you are interested check these out.

1. Ajahn Mahaboowa
Magga, Phala, and Nibbana

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.abhayagiri.org/media/books/maha_boowa_arahattamagga_arahattaphala.pdf&ved=2ahUKEwiNiLGa7LP1AhVa63MBHXV0BJkQFnoECA8QAQ&usg=AOvVaw28CSccNJPFn5pyaJx_3QKf

Autobiography of Ajahn Dtun

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.abhayagiri.org/books/637-the-autobiography-and-dhamma-teachings-of-ajahn-dtun&ved=2ahUKEwjZ6re27bP1AhUgILcAHdpoBT4QFnoECAUQAQ&usg=AOvVaw0Du1NCnymrXr8ixsSMkmGQ