You are *totally* missing the point.
The 'typos' are things that we have recognized in nature as being mistakes. We know what functional genes look like. We know what retrotransposons look like. We know the tell tale signs of DNA that has undergone random mutation.
The fact is the majority of our DNA consists of these things. Things we are as confident as one could be in science that these are errors.
Now if you say maybe they are not...then there is no way to detect design even if it appeared to be.
Well, I say maybe they are not :-)