It sure would, but what's wrong with purple links? I am an occasional user of Berkshire's website (I read their letters and statements) and find it just fine.
Purple links are used in most websites for links that have been visited. On this site it's confusing as to whether you've visited these links or not.
A huge problem? Maybe not, but not a sign of 'good UX'
Maybe, purple links can make a new visitor think that they have visited this site before, so potentially it increases trust in the website and the company.