nope, that's not really charge partitioning. what you're describing there is charge buffering. charge partitioning is literally and specifically partitioning the charge. you break up the charge between different actions. the key thing is to not achieve the full charge. so with urien, charge db for like 1/3 of the charge time, dash forward, then hold DB again (while doing a normal, maybe) to complete the remaining 2/3 of the charge, and you're at the total charge. if you charge the full duration before dashing, you'll lose it, though. that's why you partition.
it's really smooth in practice. the combos are hard but it makes moving around and poking while charging more effective. remy's somewhat more fun to use than guile for this reason, even tho he's free in 3s