Context since this has now been fixed: the original title as submitted was "Have attention spans been declining? – Yes, 65%". The bit after the dash was erroneously added by the submitter and was not part of the article's actual title.
But as OP mentions, the 65% as printed in the title conveyed the false impression that there's been a 65% decline in attention spans, whereas the actual tl;dr should have been this sentence from the end:
> It seems likely to me that individual attention spans have declined (I’d give it ~70%), but I wouldn’t be surprised if the decline was relatively small, noisy & dependent on specific tests.
