1) Does this information change your opinion regarding "the Iranian problem"?
No. I always assumed this was the case. North Korea did the same and Clinton and Albright fell for it hook line and sinker.
2) Can Iran be trusted at all to negotiate honestly over the next few years?
No
3) With this "smoking gun" regarding Iran's past perfidy, should we give any credence to folks here who seek to negotiate with them?
Reagan said it best “Trust but verify”. If they are unwilling to allow full inspections including military facilities we should assume they have nukes.