You’re right, the “both sides” claim really doesn’t work here.
Biden’s student loan forgiveness would have amounted to a gift of potentially hundreds of thousands of dollars to his most ardent supporters: young, college educated, poor people.
Trump’s proposal is a fraction of that, and all Americans would be eligible. If he’s trying to buy votes, he’s going to need to try a lot harder. This proposal is nothing like Biden’s vote buying scheme.