False. This may have been the case back in the Silk Road days but Bitcoin can definitely be traced now. This is why many deep web markets have switched over to Monero.
Bitcoin has always been traceable. This is nothing new.
Just because it was not known that it is traceable 5 years ago, this doesn't mean that it wasn't.
If the government/someone really wanted to track down a transaction, they can do so even through bitcoin mixers and whatnot.
This only works under some circumstances:
1) The mixer keeps logfiles
2) The mixers location is in the same country as the authorities
3) There has to be a court decision
If one of these points doesn't apply, this is not possible for governments.
Wow, so if that is true... Why are we not seeing government agencies arresting all the people who bought drugs on Silkroad or why are most of the money still untraceable that were hacked on the many exchanges that was exploited over the years?
Governments arrested a lot of people for selling drugs on silkroad. The majority has been traced via btc exchanges.
The (from exchanges) stolen coins, have already been laundered. You can't trace them further if they have already been sold.
Like it is the case with NEM. The majority of coins got laundered, therefore the foundation stopped tracing them.
Why did they not arrest the owner of the biggest Bitcoin mixer service that closed down a while ago? < Bitmixer.io > 
Why should they? It is not illegal to run a mixing service.
Bitcoin is for the most part anonymous, if you use it correctly and that is why government agencies are so against it. You can use other Alt coins like Monero and ZCash and Dash, but a lot of those coins are sold for Bitcoin in the end.
Bitcoin is not anynomous. It is pseudonymous.
In the end the majority of pseudonyms (addresses) can be linked together. Thats by far not anonymous.