Never said you can't boil driftwood. That's the fastest way to clean smaller pieces for aquaria. I just said to not boil if you wish to extend the usage duration of the wood. Boiling it causes the wood to break down more quickly. It's already bad enough that driftwood breaks down more quickly in aquaria than it does in the wild.
Folks around here that live on a river tie wood to cinder block, drop the weighted pieces in the river, and leave them for a couple of years. Once seasoned, the wood pieces are removed, cleaned with a power washer, and dried in the sun. Then the pieces are sold.