Nonsensse.
Of course scientific biological theories are falsifiable.
For example, if the morphological tree of life that had been constructed had been completely contradicted once the discovery of DNA and genetics came along, that would have been a major falsofication for the Biological Evolutionary concept of descent with modification.
The prediction of the ToE was that the morphological and genetic trees of life would pretty much match. They didn't HAVe to match, but they did. Thus, the ToE survived another potential falsification.
There are dozens of such survived potential falsifications.
Now, if you would like to discuss ID as science, I'd like to hear what predictions ID has made about the natural world, and what the results of the tests of those predictions were.
If you are saying, however, that ID makes no testable predictions, then it is uselss, and hardly scientific.
It is simply then a belief, or a philosopy, but it certainly shouldn't be considered a tool to further our understanding of nature.