You seem not to understand the point.
If a presidential candidate says "I don't like Taylor Swift" then they are likely to lose support among Taylor Swift fans. That's simply how politics works. It doesn't have anything to do with "coercion" or speaking to one audience versus another.
I'm really kind of amazed that you don't seem to understand that more Trump voters are of the anti-mask, "virus is a hoax" position than Biden voters. Campaigning on "the virus is nothing to worry about" was pretty much Trump's platform. It has nothing to do with being "coerced".
There is nothing "absurd" in differing views of covid between Democrats and Republicans. This was measured many times over the course of the year:
https://www.ipsos.com/en-us/news-polls/axios-ipsos-coronavirus-index
4. More Americans, particularly Republicans, deny the death toll of the pandemic.
- Almost a third (31%) of Americans believe the real death toll of the pandemic is less than the 135,000 officially reported as of mid-July. A similarly worded question in early May found that a quarter (23%) said the official count inflated the actual toll.
- Republicans (59% from 40%) and people who get most of their political information from Fox News (61% from 44%) are the most likely to say that the real number of deaths is less than the official count.
- Democrats (61% from 63%) continue to mostly believe the real toll of the pandemic is greater than what has been officially reported.
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Trump actively made fun of people who wore masks, and frequently made fun of Biden for having public events where social distancing was enforced.
Perception of viral risk was a stark difference between the candidates' messaging.
Why don't you address my other hypothetical where I have people line up for drive-through voting, and I take hybrid cars through one lane and gasoline-powered pickup trucks through the other lane. Do you think there is any "coercion" involved in the fact that, yeah, I'm going to get different percentages of people voting for one candidate or the other through those two lanes?
People's beliefs influence the choices they make and the behavior in which they engage. That's not an "absurd" position.
On balance, Biden sought to attract voters who believed that the viral pandemic risk was higher than the president let on, and Trump sought to attract voters who were less concerned about the viral pandemic risk. There is simply nothing surprising that people who were more concerned about the viral pandemic chose a method of voting that does not involve potentially congregating with other people.
You have pointed to no evidence to support your belief that voting method was not influenced by voter beliefs about viral risk. Although I assume you will simply say that the unambiguous result above (which is not within a few percentage points on either side) is simply "fake".