It seems like the altered time perception caused behaviors in the moment like interrupting others that can be verified by others, so probably this is not an issue with recall/ability to assess perception of time.
If you self report as autistic, you're probably autistic. Especially because, in practice, an autistic person is defined as someone who self-reports autistic traits to a health care provider.
Autistic people are often seen as arrogant because they speak honestly about their strengths (and weaknesses), whereas normal people avoid speaking honestly about their strengths unless they are arrogant.