Likely the reason. Even last year, they added regional language audio feeds to SS2 during IPL. This was not used for IPL LIVE telecasts though. They used it for non IPL and non Cricket sports that were broadcast at the same time when IPL matches were aired LIVE. They added regional languages at that time because the other regional language SS channels were otherwise occupied by the IPL LIVE Broadcast. I suspect that is why they might have added Hindi too, despite having 3 Hindi SS channels (SS First, SS Hindi & SS 3).
So, these "some" matches they are referring to in the tweet, most likely, like they have pointed out in that tweet itself, will be only in English. Which means that the new audio feeds in SS2 are for something else.