If syphilis went mistreated for ten years due to misdiagnosis and progressed to tertiary or neuro/opto. would the eia/cia/fta/tppa still be positive? or could there be possible false neg from lower antibody titers. pubmed articles say possibly?

Yes: all these tests would still be positive after 10 years if you had untreated syphilis, or treated syphilis that was cured. No PubMed articles disagree with this; you have misinterpreted what you found. This is your 4th or 5th question indicating obsession with possible syphilis despite 100% proof against it. Stop asking. If this obsession is affecting life and happiness, seek counseling.