Well I think you're right, he does mean blocking. But then again, he really wants to be a Move TE, which is kinda like a glorified slot WR who is a size/speed mismatch--exactly what he is athletically. Much like Kyle Pitts in this draft, you don't want those guys wasting their talents blocking too much. But by the same token, if they become competent blockers, it no longer telegraphs them being in the receiver pattern. TE's are a chess piece akin to a knight, they're just hard to contain and nearly impossible to match up against if they're athletic freaks like Gesicki. Good defenses need to account for guys like that on every play.
Now, none of us expect him to be blocking 40% of the time or anything, but being competent at it and blocking 20% of the time would be a welcome addition.