Sure, but that's not what the other poster said. They said they shouldn't have a platform "at all". Meaning, "any platform", which is the point I disputed.
Firstly, "arranging a platform for themselves" is the same as "being given a platform in exchange for goods and services (typically money)". If you're making this argument, then there's no distinction in what you describe. They're "given a platform" in exchange for services rendered as an AI ethics panel member.
Secondly, it's debatable whether they're even being "given a platform" in this case anyway, because their duties are specifically surrounding AI. Going off on an anti-trans rant or something would get them removed. Since that's the sort of platform you're presumably arguing against giving them, so there seems to be no conflict here.
Presumably, what you actually meant by "not giving them a platform" is that they shouldn't be given legitimacy or validation. I'm not sure I can agree that their presence accomplishes this. Some people give the pope some moral authority, but plenty enough people aren't swayed by his fancy hat, and his lofty moral status enables good discussions over what's truly ethical. Christian and Catholic engagement is and has been falling precipitously.