It has to do with MS.
He deleted his tweet but this is the tweet he made in Japanese.
MSのクソどもはよー 俺をナメてんのか ?
神谷英樹 Hideki Kamiya (@PG_kamiya) 2015, 7月 29
Rough translation.
"Those shits at MS... are they fucking with me...?"
Hahaha. Should have gone with Sony bro.
In all seriousness. What could it be? Maybe they are not letting him present and treating him as a prop like he said.