No reason to not think the address was being mined to with a Bitaxe given the worker name and average hash rate for some time but...the 1hour average shows on CK pool (or from the screen shots anyway) it bumps to 2-3 TH/s unlikely only one Bitaxe was involved when the block was found.  

 Screenshots are not proof. Can I validate the screenshots myself? Again, I'm a fan of both BitAxe and CK pool. I'm just saying I haven't seen something that does not require trust. If I am missing something I'd love to be wrong.