Was I incorrectly sent a letter saying that I am not entitled to free prescriptions? (Evidence inside)

I have received them for years.

Image of some of the letter I received

I think these two pieces of evidence show that I am entitled:

Image showing that I am on LCWRA and receive under £935

Link to a .gov page showing that people are entitled to free prescriptions if they are on LCWRA and receive under £935

I am mainly posting here because the whole thing has made me feel nervous (I am autistic) and I just wanted peoples' input before I phone them to help me to know what to expect.

I feel like the things I wrote make it seem pretty 'cut and dry', but I am not sure because the last link is from 2018 and I can't find any information on if stuff has changed since then.

Also, if I am no longer entitled, then that is something to accept, but it feels pretty unfair to charge me a £100 fine without letting me know that I am no longer entitled first.

Thanks for any help. :)