That's not important; it's just to establish that Amazon lobbyists are active. The reason they were banned is because of their refusal to attend the hearings. That is: "either fully participate or don't participate at all – you can't pick and choose what's convenient for you".

This is also what Amazon's reply addresses. I don't know if Amazon's claims that these meetings are "clearly one-sided and not designed to encourage constructive debate or objective scrutiny" are accurate.