The question is whether the developers care about the specific opinions of the content creators, or if they care about how content creators represent the game to their viewers. The difference is subtle but important.
Based on the all the comments YoshiP made to Zepla during the media tour general Q&A per the way she recounted it, he seems to be more interested in the latter. The "thank you for the video" was just a lead in to "don't do it that way in the future".
The door swings both ways. Content creators can have sway over the sheep in their audience that look to content creators to form their opinions for them but content creators many times adjust what they present to please their viewers (or to please those who have influence over whether they get to attend high publicity events).
I don't think any of the FFXIV content creators has such a large audience that any spread of opinions is going to reach very far let alone influence a significant number of players and/or potential new players. But I understand that someone who relies on content creator opinions to validate their own would believe otherwise.