You were given false information.
The new law, which took effect in Feb of 2004, expands the period for considering prior DUI convictions when determining the number of offenses. It was previously 7 years, but is now 10 years. In other words, if you had a DUI over 10 years ago and were arrested today, today's arrest would be considered a first offense. Less than 10 years ago, and today's arrest is a 2nd offense.
PennDOT wil not expunge the DUI from your driving history. However, any non-law enforcement use of your driving record will only show offenses up to 10 years ago. If I, as a police officer, request your driving record, I will see the entire record. I've seen records with offenses as far back as the 1970's.
When did they stop adding fluoride to the water, and start adding STUPID?