That’s right, I agree with you. The requirement to be included in the list was at least 25 tastings by the RumX community in the period between 01/01/2021 and 12/31/2021. There is no additional weighting by number of ratings. Thus, it is a simplified representation and more complex aspects such as the number of releases and the depth of the product range are not taken into account. The list is deliberately not intended to express “the truth”, but to give an overview of the RumX community’s tastings and to encourage exciting discussion. 
What I can imagine as an optimization for next year is, for example, that only the top bottles of a bottler are considered. In this way, bottlers with a very wide range, such as Rum Artesanal or Spirit of Rum - are not “penalized” by their diversity.
In addition, with the growing community, the minimum number of ratings can be set higher and higher.