The E.ON website does have a link to their most recent statement which is 2022 - but this assessment is for 2021 statement? However, the legislation requires them to have their latest statement on the homepage, so unsure if it's fair to mark them down for this?
Found it - and it's their 2021 statement so this metric should be "yes"
The company does not have a direct link to their MSA Statement on their homepage.
Homepage drop-down menu in the navigation bar: About E.ON / Modern Slavery Statement