The fact that the combo helps accumulate meter is a moot point, all combos do. Including meterless ones.
You said you don't want to do anything before 623d(2) because it will cause a scaling issue. And it will.
What the "reset" thing the person is talking about is where you may set up a situation in which the opponent is landing or escaping freeze where 623d(2) will hit as an unblockable and the "first" hit of the combo, given it's full charge time.
However, as I said above, this is impractical to try to set up because you have better, more reliable options (like doing a normal corner bnb) and if people do not recover as you expect or fail to shake out of ice, you just wasted the 25% meter and threw away a chance at a perfectly fine meaty 5b.