In many cases it can be identified not in all cases. Noob who don't know how to hide can be trace.
Same kind of reasons gave in your other article. Don't have time to quote all points what say it can be annoymous and so you must read carefully to understand what writer trying to saying.
If it can be identified even in "many cases" how can bitcoin be anonymous? If the user is adding external technology like VPN/TOR/Shell Accounts/etc then these provide the critical link in gaining anonomity not the bitcoin, so saying bitcoin is anonymous is not correct.
Said that I have read the article and don't understand what you are saying, care to explain?
Regards,
BLife