Anybody have experience taking on Powderpost Beetle infestations?

I am looking at buying an 18 yr old home and the house inspector found an active Powderspost beetle infestation apparently in the exterior walls of the home. The exterminator dude says “no problemo” to get rid of them but everything I am reading on the web says it is a major uphill battle. Any Jelly help out there would be greatly appreciated.