A run blitz is when you send extra defenders, generally linebackers into the back field, but instead of running in in pursuit of the qb they are fixated on the RB and more cautious and aware of angles. You might send a lber off the edge but in a contain rush. Very much the same as you might do to a qb whose primary skill is running. Its often mixed with twists where rushers switch the rush lane from the one they line up in, it helps disturb inside zone runs like ours.
Technically a blitz is when you send 1 more rusher than the offense has blockers, but its generally used for sending any rushers other than the DL. Sending pressure that is less than a blitz (like we frequently do with Bighill and our wils) is technically a stunt.
Toronto mixed run blitzes, twists, Gap cancellation (dl and lbers attacking the gaps rather than the OL infront of them) and edge contain very well. They also anchored and released. Engaging with the OL, but not trying to rush. Waiting for the rb to get close then rip away from the OL to make a tackle. Basically trying to hold your ground with the OL, not mash them or beat them.
Pretty much tldr yes.