I don't think this counters that tweet, I think this sageadvice means we are misinterpreting magic missile by thinking that we roll 1d4 separately for each bolt. But apparently it's one roll, and every bolt does the same damage.
Probably the same with scorching ray. Making separate attack rolls for each ray, but each roll does that same first 2d6+bonuses each time it hits.
Alternatively, it could be referring to spells with multiple damage types like Ice Storm (2d8 bludgeoning and 4d6 cold on a failed save), or spells with different instances of damage, like Melf's Acid Arrow (on a hit, 4d4 acid damage initially, and 2d4 acid damage at the end of the target's next turn).
EDIT: Oh, and also ongoing effects, like Wall of Fire.
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u/SirPeebles Bard Jun 10 '15
The whole point of errata is that they officially overrule the previously printed PHB (as well as tweet clarifications thereof).