I know that, but it is all regarding the same thing, disembarking from vehicles after Deep Striking, is not possible, unless it has a special rule, like Drop Pods! Other then that if you read (all of it too) Pg . 79 and Pg. 43 (haven't got it in front of ms but it's the whole page about Deep Striking, it says that vehicles coins as moving at cruising speed (except walkers, I think) then if you look at the rules for disembarking of Pg. 79 it very clearly states that you cannot dismount a transport if it moves at cruising speed, there very clear about it, no disembarking, no charging (even if it's open topped or has assault ramps, none of it, like I said my mates Duke DE army, he tries that all the time on people, none of the proper players play with him anymore cause he keeps trying to make us let him use it, but yeah, short answer is no you can't use that tactic, not legally of course
So unfortunately that tactic won't work, otherwise it would be over powered (play the big DE Vs. IG game in the back of the rule book with the portal and you will understand why)