That URL should present a login screen which you could use if you have registered any Intel software tool application, either evaluation or purchased.  The top level URL will offer to register any such application and open an account for both that site and premier.intel.com support.
If you are alluding to the fact that thread profiler for linux is not present on the screen which offers evaluation licenses, that is true, but does not mean there is no such thing.  I would agree also that I could not recommend purchase of this product without evaluating it, and I find the openmp_profile option of the compilers sufficient in practice.
I don't know whether anyone has requested an evaluation of the linux version; if you have the Windows version, which appears to be expected, you could submit a request on premier.intel.com to find out what the policy may be.  It's even possible that omission from the evaluation menu is an oversight.