That is a good question.

It actually holds very little value in terms of SEO. Truth to be told, it would actually probably have been better to wait until 2021 to make this post, and use "2021" in the title instead. It's only for visibility and to show that the content is up to date. It also often looks appealing to have numbers in a title. So having this article done in early 2021 might have worked better, in the sense that the content is up to date. But, 2020 looks more appealing than 2021..