Author here.
Yeah, that seemed strange to me, too, but that was how my lawyer told me it worked. And the buyer's lawyer cared enough to fight about the exact amount of liability, so I assumed the buyer's lawyer felt that way as well.
In practice, it seems like liability protection would have to change in some way otherwise the seller could abuse the system. Like imagine that I sell the new owner $200k worth of inventory and then the new owner discovers that, unbeknownst to either of us, the inventory has some kind of defect and is unsellable. If the buyer comes back and says, "Hey, I want my $200k back," it would be strange if I'm allowed to say, "Oh, too bad for you. I've shut down the LLC that sold you that inventory and moved all the money to my personal accounts, so there's no money for you now."