That is a blanket statement which is not correct. In the real world the vaccines are protecting against severe disease and death. But it has emerged that they are not as effective in protecting from infection from the delta variant. As new variants emerge, new vaccines and booster shots will be developed. From the article you linked -
There has been no data so far that has found either vaccine's protection against severe disease and death is significantly less against Delta, and the study notes that there doesn't appear to be much of a difference in complications stemming from breakthrough infections based on which vaccine someone got.
And experts cautioned against rushing to conclusions.
“This is the kind of surprising finding that needs confirmation before we should accept its validity," said Cornell virologist John Moore.
