You’re right. This won’t convince a Trump voter to vote for Biden. They dismiss anything from “liberal news” which is every outlet besides the far-right. It’s been my experience that talking to a Trump supporter is kicking water uphill.
I wrote that to do what Biden’s campaign is failing to do, speak to all of his accomplishments next to Trump’s “accomplishments,” in hopes of informing the discouraged, disengaged, and disenfranchised.