Torque plate honing is basically where plates are attached to the block deck face, and torqued down the same as the heads would be...this is so the block is "distorted" in the same way as it would be with the heads bolted on, and the bores can be bored perfectly straight and true with this load placed on them.

Sleeving has nothing to do with it, because whether you had sleeves or stock bores, you'd still torque plate hone them.