While I wouldn't be surprised if such a thing does happen, I don't know if that we can say it happened yet, as I don't know how recent the 2021 death statistics

While I wouldn't be surprised if such a thing does happen, I don't know if that we can say it happened yet, as I don't know how recent the 2021 death statistics are for Belgium. Usually it takes weeks or even months for mortality figures to be correct for a year, so that graph could just be showing that they don't have the full mortality results for 2021.