Whether Theresa May is, or is not PM at the time that the result of the official enquiry into this dreadful tragedy is concluded, may not, I suggest, be relevant.
I suspect that the statement is intended to try to reassure that this matter is being taken very seriously, is endorsed by her personally, and that it will remain so until its conclusion.
Taking into consideration all of the major events that have occurred recently which, through direct or indirect connections, have shone the spotlight upon the heart of Government, it is understandable that such precise language is used, especially given the "flak" that has been directed at the PM herself.
It is not surprising that the statement issued is in what may be considered, by some, a "neutral" tone. There is now, I think, caution, reluctance or perhaps, even, fear, among her advisers to ensure that anything "officially said" which may provoke further anger and acrimony, is strenuously avoided.
Given the recent dismissal of some key advisers, perhaps the current strategy of their "spin doctor" replacements is a belief that they should follow the maxim of ameliorate rather than infuriate?
Only time may tell if the response is the right one and for all the right reasons but sometimes, I think there is a case for "telling it like it is." However, I concede, that somehow, we may have lost the art or skill of doing just that in "getting across" the message in a way that is understood and deep down accepted as honest, genuine and sincere!