It really does not. maga means you support trump extremely, not as the lesser of two evils, or a means to an end. About 20% of voters are actually maga.
More importantly, Biden never said that it was. The closest you can get to that is Clinton saying that almost half the people who voted for trump were a "basket of deplorables." Even that is not all of them, but only half of them. That would put the percent of total Americans in that "basket" as about 10%, not 50%. And again, it was Clinton who said it, not Biden.
Again, that is not true. 92% of Republicans who voted, voted for trump. 8% who voted, voted against trump. Many more did not vote at all because they found trump disgusting, but could not bring themselves to vote for a Democrat. Many of those Republicans who did vote for trump felt very bad about it, but either saw trump as the lesser of two evils, or a means to an end. For instance, an anti-abortionist who found trump's paying of women for sex, and then requiring them to get abortions disgusting, might vote for trump to get Supreme Court Justices who would oppose abortion.
See RB 60's post #79. Biden uses "MAGA" often.