Not much of a denial
"Kaspersky Lab has not been provided any evidence substantiating the company’s involvement"
"does not have inappropriate ties to any government"
"similar levels of access and privileges to the systems they protect as any other popular security vendor"
In other words, yes, they absolutely were involved. They don't even try to deny it - "you haven't shown us how you know we did it" does not even come close to denying having done it, while "similar levels of access as everyone else" and "no "inappropriate" ties" is simply pointing out that everyone else does exactly the same. It makes the news quite a bit that the US government demands lots of information from the likes of Google, Facebook and ISPs, but you'd have to be pretty special to believe that other governments aren't doing exactly the same, or that other companies with useful information aren't also targeted.