

Regarding Chakma, is this claim unsubstantiated or is there any literature on it?
From: https://en.wikipedia.org/wiki/Chakma\_language#
There are no citations for the things highlighted in the image and I couldn't find any of those things searching online. Secondly the text on the second image blatantly contradicts the first image and itself:
"originally spoke a Tibeto-Burman language belonging to the Jingpo-Luish branch", "contains abundant vocabulary items that belong neither to Indo-Aryan nor Tibeto-Burman linguistic groups, likely originating from their ancestral language".
Jingpo-Luish itself is Sino-Tibetan, it's a blatant contradiction to state that a Jingpo-Luish substrate means having vocabulary that is from another substrate altogether.
If these claims do actually have no sources, I'd like to know at the very least how this misinformation came about.