Who are the angels who sinned according to literally every commentary I own?

In my video Theopolis vs. Heiser: The Divine Council Debate Explained, I examined Christopher Kou's critique of Michael Heiser's Divine Council Worldview. One of their key disagreements concerns Genesis 6:1–4. Kou rejects the traditional angelic interpretation, arguing instead that the passage describes human cultic unions. I argued that the supernatural reading is the most natural interpretation of the text, fits the broader biblical and Second Temple context, and is reflected in the way Peter and Jude read Genesis 6. In response, a viewer commented, "angels who sinned is a reference to Genesis 6? Really? That's a stretch bro." Since this objection was not an argument from the text but an assertion that the connection is implausible or idiosyncratic, I decided to investigate how commentators from across a broad spectrum of Christian traditions understand 2 Peter 2:4 and whether they connect it to Genesis 6:1–4.