Technically, legally, he's right. All you need to do is an hour of ground and an hour of flight. Assuming you have your instrument, do it at night, make 3 takeoffs and landings to a full stop, have your instructor sign off on your IPC, and you'll be legal (for whatever category/class of aircraft you're flying).
Now, practically, it'll take a good long time for you to get proficient again. What certificates and ratings do you have? Even if it's just a private rating with no instrument, after 7 years, I'm guessing it'll probably take 10-20 hours of training (not just flying, training) to get proficient again. CS/MEL IA, probably a lot more, I'd guess it'd be more like 30+ hours. There will be a lot of studying to do, and I'd suggest getting as much TAA time as you can. There have been a lot of changes with regards to avionics in GA aircraft in the past several years.
TravDK is right, a lot of it will come right back to you, but don't short change yourself or the public. Make sure you are completely proficient again (ie you could pass the CS/MEL IA checkrides) before you start marketing yourself as a commercial pilot.