Is this a good deal? Buying first road bike

I found this bike on Facebook marketplace for $450 and I want to know if it’s a good deal or I’m getting ripped off. It’s my first road bike and I really want to get into cycling as I am also beginning to train for a triathlon. Any advice would be greatly appreciated

this is the criteria they gave me

Giant Liv Avail Road Bike

Composite frame
Shimano Ultegra components
Elan wheels
21 speed
Good for a person 5-5.4 ft tall

Also more info he gave me:

I bought it from the original owner. They used it for bike trips around the us and took impeccable care of it. I’ve had it for a couple of years but find I don’t use it very much. The original owner replaced a lot of the original parts with nicer ones