I've just successfully upvoted the OP on the page mentioned. The other radio buttons and the [vote!] button are still there.
I then successfully upvoted and downvoted two random anonymous posts in that thread. Again, the other buttons are still there.
After 17 years, it probably doesn't matter; however, if someone wants to test as well, they could reverse my random voting. The nodes in question are:
<code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>