They said: “Some panels have held that a respondents lack of response can be construed as an admission that the respondent has no rights or legitimate interests in a disputed domain name.”.
I guess you can’t ignore the ‘panel’ of an international institution. They are full of themselves.
They are right. Silence implies consent.
BUT -
The respondent can send the panel a letter responding to their decision and tell them to do something anatomically impossible with it.
THAT will hold up in a court of US law, and the respondent can go on about his business.
:-)