Not voting is a vote for Trump, but according to Republicans not voting is a vote for Biden. So they cancel each other out to net 0 difference. Math

This line of thought is logical for libs, because they do not understand that one votes for a candidate, rather they think one votes against a candidate. I used that lib logic about not voting to do a bit recently, feel free to steal it

it's not a vote for Trump because I don't owe the democrats a vote

To be fair, its based on who you would've voted for if you had voted. The message is for people who would've voted democrat. What they ignore is this acknowledges that democrats need to play to their base, which they dont do. Democrats always play to the non-existant center and rely on chastizing their left wing to get their votes. If a democrat actually played to the center of their own party they be wildly left wing in US terms.