I don’t, actually in my example of the three transactions I’ve even discarded basefee as relevant for the discussion. Is it the case that the miner improves their payoff by including only the 100 max fee transaction under the median premium rule, instead of all three? (assume basefee is 0)

The attack is a consequence of allowing the miner to decide what the median of the premiums are by strategically including transactions, so in effect, deciding what the gas price of a block is. It’s not the case in 1559, if you don’t include a transaction, you simply lose out on its revenue, it doesn’t change the price for other included transactions. I understand the median of a particular value distribution is robust to small deviations of the distribution, but it’s besides the point, because the miner has full power to enforce the median premium by selecting judiciously which transactions to include.