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No this is incorrect. The value of your post to begin with is in terms of steem. The value displayed in the UI multiplies by the steem price because the blockchain thinks 1 SBD is worth 1 USD.
In the post I point you to where the actual estimate is computed, and you can see starting from where it takes a fraction of the reward pot.

Thus, as steem price fluctuates, so does that number in the UI. Which by the way, is not immediate-- it averages the price in the last 3.5 days.

Thanks for this clarification. I was just assuming that the OP was looking at it in a "glass half full" vs "half empty" sort of way. :) I'm impressed by your understanding!