I mean, I've read some of her past stuff that was shockingly wrong on certain legal or technical points. She's also not a criminal lawyer.
Their letter is probably based on her BTBS article. It already contains a correction in the editor's note at the bottom (no surprise that Sheryl Ring fell completely for the skull fracture lie).
She also supposes motive the motives of Bauer's team, which seems irresponsible at the very least:
So here is a plausible interpretation:
1. Sheryl Ring's article had (and may still have, for all we know) lies and falsehoods in it
2. Sheryl Ring's article may have the law completely wrong in certain ways (I don't know)
3. Sheryl Ring's article is stating as fact the motives of Bauer's team, which could be completely wrong