However, it then raises the question of why the render shows the radiators mounted in the front.
Who says they're at the front? Other than thats where the rack ears are mounted it looks like could go either way. In a lot of facilities its now preferable to have all the cabling on one side in any case.
Well that is possible although unless they are using some custom 1U reverse flow PSU, the PSU would still have the airflow in the wrong direction. Just about any case can be installed in either direction but finding a PSU which intakes out the "back" is going to be tough. Also the design really wouldn't make sense reversed. You would have no intake fans and all 11 fans AFTER the obstruction of the boards. Anything is possibly but occam's razoe an all that.
For those wondering what the hell we are talking about here is a mockup of the server.

Note I have no idea what the final unit will look like but looking at the photo "as is" the most plausible scenario is that the edge with the rack ears is the "front", airflow is front to back (in photo above it would be bottom to top) and goes:
font edge (cool aisle) -> 4 pusher fans -> radiator -> 4 puller fans -> 3 midplane fans -> 3 modules on left + PSU on right -> back edge (hot aisle)
Maybe the description is right but the mockup doesn't match the description. For the record I really doubt HF had either the case or power supply custom fabricated. My guess is it is an OEM 2U "deep" (~30" comparing length to board) case and PSU.