The phrase "nonsense something is" means that there is no logical or rational basis for something to be considered true, valid, or acceptable. It suggests that what is being referred to makes no sense and cannot be taken seriously.
Sentences with «nonsense something is»
People who watch that crap don't seem to realize what utter nonsense it is. (religion.blogs.cnn.com)
Same nonsense he's been doing for several years. (justarsenal.com)
In the case of this game while it's easy to yell bribery or some other nonsense it's worth considering that the author in question simply had a very different experience. (wolfsgamingblog.com)