They already got what they wanted, which is good publicity for the game. The 'outsiders' to the community don't know he didn't fulfill what he promised, so they only stay with the initial information.
In other words, gaming sites think "hey PD is going to listen to the community. What a nice company"; even though they ultimately did not.
There's several hundreds of unanswered questions, with several thousands of 'likes' in total.
https://www.gtplanet.net/forum/board/kazunori-yamauchi-qa/?order=first_post_likes
Three of them are considered to be "answered" by the mods. Those are spots #8, #13 and #16 respectively, by likes:
1) "Will standard cars be in GT7 (for the PS4)" --> Yes they will be.
2) "Camber problem (in GT6)" --> Already fixed. No reply in the thread or any info from PD though.
3) "Would you consider having someone from PD communicate regularly with the fans"- --> Pit Stop blog, which is sporadic, one-sided communication consisting of blog posts. No interaction.
By "by the mods" I mean that those questions weren't answered by Kaz or by PD directly in the subforum, as it was announced. Instead, those three were indirectly answered, in interviews in different sites, adding the said blog and in one minor patch.
This means in actuality they haven't replied to a single one