I think they are discussing more on the topic of people thinking they can bring in Sableye while you Shell Smash to get a burn rather than 1v1, I don't know why the hell you would think of setting up a Shell Smash unless you're hoping for a lucky crit which is complete bs or it is your last Pokemon, in which case you have nothing to do.But if it's on 1 vs 1 u get WOW next turn, allow me demonstrate
1st turn,
Sableye uses willowisp, lum berry takes care of it while Bar shell smashes.
2nd turn,
Sableye uses WOW again, and Bar gets burned. Dealing 40~50 % would mean that it can live one hit(possibly) and hit it with a foul play or just keep on recovering.
Not a sturdy block, but just say'n that it could work
EDIT: Snip'd but yeah...^^ agreed