I reworded the passage to be:

How come this is true (apart from the special case when other agents penalise you specifically for being a maximiser)? Well, agent A will have to make decisions, and if it is a maximiser, will always make the decision that maximises expected utility. If it is a satisficer, it will sometimes not make the same decision, leading to lower expected utility in that case.

Yes, the satisficer can be more risk averse than the maximiser - but it's precisely that that makes a worse expected utility maximiser.