Yes, an update in the wiki also notes that.
I used this site: http://wiki.dns323.info/howto:chroot_debian
That’s pretty much the same machine, but then without wireless.
That site uses the exact same fun_plug hack.
The site has different command for the bootstrap. I suggest you try that one.
(Not sure though, reading from the command lines, the CH3WNAS has a PPC proc, and the CH3SNAS an ARM proc)