Not at all the same thing. The isolator is trying to absorb stray energy by absorbing it at the cartirdge. Of course, without artifical intellegence, it cannot know what is stray energy and what is music, so it will try and absorb everything, not a great idea in my book.
The longhorn works like a tight rope walkers pole, providing a high tortional moment of inertia to twisting motions, allowing more of the energy from the stylus to make electricity in the coils, and less to induce stray vibrations in the cartridge/arm system. Its the way to have a high mass headend without high mass, just using a bit of mass in the right place to do the job.
Its free, you can do it yourself, and it works.
Of course because it does not cost $4000 and is not dipped in virgins blood under a full moon, and we tell you exactly how to do it, no secret magic engineering or pages of purple prose reviews in the audiophlake press, is based on good mechanical engineering methods rather than on voodoo, then it obviously cannot be any good.
Frank Van Alstine