I think it is worth setting the record straight on this one, although I have nothng to do with Pprune whatsoever apart from being a user.
In simple terms
Anyone who uses the internet has to have an address.
That address has to be given to every site you visit.
So yes, the claims or comments are correct you can be traced.
Though it would require co opertaion of you ISP to turn your TCP/IP address into a phone number in some cases.
Very easy though to spot the corporate users!