None of this has been proven scientifically. It is simply pseudo-science. It is possible that Tad James was a member of Scientology because the whole process is very similar to the scientology Dianetics auditing procedure. Both Dianetics and Time Line Therapy are very similar to Freud's abreactive therapy. Freud himself abandoned this when he decided it was not helping.
Further research into abreactive therapy has determined that it cannot help, and may in fact make things worse for the person. Scientology has had examples of this with people killing themselves after receiving therapy. This makes me wonder how many people have killed themselves after Time Line Therapy?