I fully believe their "top sellers" list is simply a curated marketing showcase of whatever they want to push because I sincerely doubt anyone is actually buying Godfall.
I think the best sellers list is legitimate, but there are a lot of qualifiers that make it near impossible to gauge sales. Presumably the list includes gross revenue, which would explain freebies like NBA 2K21, Frostpunk and Control making the list due to additional DLC and microtransactions. At the same time, it may or may not exclude preorders which would explain games like Battlefield 2042 not making the list. Also the volume of sales may be low and a title like Godfall wouldn't have to move a lot of copies to chart.
If I were personally curating the top sellers, I would put highly anticipated games like Battlefield, Naraka Bladepoint and STALKER 2 near the top to let people know they exist, especially since they're completely missing from the EGS front page right now. It would also help make the store look better compared to Steam where those games are topping that store's charts.