This is from the linked article:
...
To overcome this, the research team used recent advances that allow different sets of data to be sent without the corruption.
...
How I understand this: for example if the method is used on text, that encoding is done by using different words with the same meaning. So if you don't know the original message, there is no way to figure out there is something hidden in the text message. Because the meaning itself is completely unchanged.
thesolarcode t1_jbij3rc wrote
Reply to comment by volci in A group of researchers has achieved a breakthrough in secure communications by developing an algorithm that conceals sensitive information so effectively that it is impossible to detect that anything has been hidden by thebelsnickle1991
This is from the linked article:
...
To overcome this, the research team used recent advances that allow different sets of data to be sent without the corruption.
...
How I understand this: for example if the method is used on text, that encoding is done by using different words with the same meaning. So if you don't know the original message, there is no way to figure out there is something hidden in the text message. Because the meaning itself is completely unchanged.