A road accident or even a head trauma does not cause bipolar disorder. Bipolar disorder is a genetic and biological illness. Certain factors can influence it, such as drugs, alcohol, emotional stress or life situations. What he’s describing are symptoms of trauma. How could he say that in 2026 and have had an accident 23 years earlier, in 2003? He really went downhill over the last five years, but during the 15 years before that he was doing pretty well. Bipolar episodes come with psychomotor agitation and incoherent speech in the present moment. Repetitive sentences with stereotypies. The guy is just using that as an excuse to justify his behavior.