The difficulty score multipliers in the Nightfalls has changed. Reaching a score of 200k in this week's Nightfall is impossible without going out of your way to do so (super spam for orbs, revive cheese). Hopefully, this is not the case for the rest of the Strikes currently in rotation.
It is also inconsistent with the progress gained for the Vanguard Playlist pinnacle. One Master completion gives 100% progress. Combined with the added power level caps, running Nightfalls on the highest currently available difficulty, outside of unlocking the following Guardian Rank, is not worth it.
For reference, these are the old and current score multipliers in the activity
Adept: 1.25x -> DIFFICULTY REMOVED
Hero: 1.5x -> 1.25x
Legend: 1.75x -> 1.5x
Master: 2.0x -> 1.75x
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The Challenge for 200k points is cumulative, not a single run.