The American Society for Biochemistry and Molecular Biology addressed this idea here[1], as did The Conversation[2], Scientific American[3], and the AP[4].

tl;dr: you're looking at an average trend that may or may not actually exist. There's no guarantee that it will follow the trend, that it is average, that it won't become worse in some aspects or that the trend even exists.

[1] https://www.asbmb.org/asbmb-today/science/112920/will-the-co...

[2] https://theconversation.com/will-coronavirus-really-evolve-t...

[3] https://www.scientificamerican.com/article/how-will-the-coro...

[4] https://apnews.com/article/fact-checking-011488089270