There’s an assumption that all Ds are for Biden. We do not know that.
It’s probably easy to make certain assumptions. For example if there is a massive increase of voters in Philadelphia its fair to assume that the voting Trend will be as it has been for decades so a fair assumption is that Biden was able to increase turnout. You can probably do the same thing on a district level in NC. For someone who knows the state well they can use this information to determine the state of the race
We can reasonably assume that 97% of them are.
Theres an assumption that all Ds are for Biden.
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Is there an assumption all Rs are for Trump?