Others have already debunked that line of thinking. It's not that they didn't used to be allowed to block and are now firing off the ball all of a sudden, that's all spring coach speak. When you run a lot of rpo/designed pass plays your lineman can't just drive forward every single play and then have the play be a pass, that's asking for a penalty with lineman down the field. It's scheme related and they do what they're told. Run plays are blocked differently, this isn't binary.
Here is what both we and Pitt did last year (credit to
@J-MAGICand his newsletter here for the graphic and leg work)
View attachment 19621
We ran close to 60% rpo/pass where lineman are catching or redirecting rushers and not firing off the ball by design. Pitt was at 72%, we shall see what we get this fall. That's a lot more pass blocking than firing 3 yards off the line right away.