Yes, by default. The artist receiving feedback sees your score, your written feedback, and a generic role label (like "A musician" or "A curator"). They don't see your username, profile, or any contact info.
Reviewer opt-in: "Let them contact me about my feedback"
When you submit a rating, there's an optional checkbox: "Let them contact me about my feedback." It's off by default. If you tick it, the artist can open a private chat with you about that specific review.
From the artist's side, your review will show a chat icon. Clicking it opens a 1-on-1 chat thread, pre-filled with the song title and the feedback you left. From there it's a normal SubmitHub chat.
Most reviewers leave the box unchecked. Anonymity is the typical experience.
What premium requests reveal
If the artist used premium credits to request ratings (instead of earning them through the rate-10-get-7 grind), they see a bit more detail on each review:
You're still anonymous in the sense of name and profile. Premium just unlocks the extra context above. Premium artists can sometimes piece more together about who's reviewing them, but you stay un-named unless you tick the contact box.
For artists: how to recognize a chat-friendly review
On your song's ratings tab, look for a chat-bubble icon next to a piece of feedback. That's a reviewer who's invited contact. Click it to open a chat. Reviews without the icon stay anonymous and there's no way to reply.