But there's two alternatives that're guaranteed, does not require re-finishing or dissassembly, nor does it leave any residue behind.
The first is the quickest and probably easiest, and that's ammonia fuming. Your friend can simply buy a large enough tarp to completely cover the furniture, with enough left over so that it can be sealed to the ground (or a driveway). Note that this treatment will kill everything under the tarp, so doing this on a lawn is probably a no-no unless re-seeding is desirable.
Anyway - purchase some 30% Ammonium Hydroxide (technical grade - the cheapest) from Thermo-Fisher in Raleigh, place the furniture on a concrete surface, or a dirt surface that doesn't have any desirable plants, place the tarp over the furniture, and weight down the tarp all the way around it. One way to weight it and make sure that little gas will escape is to shovel some dirt/sand around the edge of the tarp.
Using a carbon respirator (you can get a very effective one from Home Depot for about $20), pour the ammonia in a wide, low plastic container, and place it under the tarp. Wait 12 hours. Un-tarp the furniture and allow it to "air out" for another 12 hours. Presto - instant sterilization.
Note that this treatment may change the color of the stain on the furniture. It will -probably- darken it, but one might want to do a test piece to be sure.
The second way is a bit more involved, but does not require any chemicals. Buy a roll of thick painter's plastic sufficiently wide to make a bag around the biggest pieces of furniture. Buy some oxygen-scavenger packets (these are packets of iron filings and a catalyst that will react and sequester oxygen from the air). Make an envelope around each piece of furniture, include about 20 of the oxygen scavenger packets, seal the plastic with double-sided tape, and then tape the seams with the foil-type duct tape. You will know that the oxygen scavengers are working because the envelopes will deflate slightly as the oxygen reacts with the iron.
Leave this for 10 days, checking to ensure that there are no holes in the envelopes. The lack of oxygen will kill the borers and their eggs, with no residue and no stripping required.