See my post above which came right after yours, and it will explain everything.
If you've already been communicating with the doctor about cancer since October 2022, then yes, he will freely discuss the cancer back and forth, even if something new is found.
In this case, it looks like the adenomas removed were cancerous, but she already knew she had thyroid cancer since October, so this wasn't a huge shocker or game-changer. Only if the cancer has spread (no indication this has happened) would it be bad news that he likely wouldn't e-mail.