Probably because in order to visually show where the weakness is, you'd need to show the schematics/design to pinpoint the ducts which were not in his possession when recording the message. I dunno if discussing it would accurately direct the fighters well enough. And he was taking a risk sending the message in the first place, assuming he was being held captive and closely monitored, so taking a large amount of extra time to describe the structure and the points to hit would probably be too risky. I don't think he even thought it would get to his daughter. But maybe his hope was the rebels would support the mission in the first place and it wouldn't be as suicide-y as it was. If they weren't forced to go in alone, they probably would've had adequate enough support to get out.
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