Article 16, section 5 of EU Regulation 2021/695 implementing the scheme:
"The conditions determining the level of financial contribution shall ensure a regular automatic correction of any significant imbalance compared to the amount that entities established in the associated country receive through participation in the Programme, taking into account the costs in the management, execution and operation of the Programme. The allocation of the financial contributions shall take into account the level of participation of the legal entities of the associated countries in each part of the Programme."
So this sounds at most like a clarification of the rules expected in any association agreement for Horizon.
"The conditions determining the level of financial contribution shall ensure a regular automatic correction of any significant imbalance compared to the amount that entities established in the associated country receive through participation in the Programme, taking into account the costs in the management, execution and operation of the Programme. The allocation of the financial contributions shall take into account the level of participation of the legal entities of the associated countries in each part of the Programme."
So this sounds at most like a clarification of the rules expected in any association agreement for Horizon.