Arb bumper removal Question.

Tomorrow I'll be removing my arb bumper due it needing to be Fixed up in certain areas due to the previous owner letting the rust get to it. Question is, the 3 bolts on either side underneath is that the only thing holding this bumper in place? 6bolts? The filler plate was shot which is the reason for the pile of rust flakes down below. The rest of the bumper on the under side just needs a little scraping sanding and priming then I'm going to re powder coat it satin black. Also ripping out the winch because it is shot as well, parts of it were actually crumbling off. No plan to get a new winch at the moment and shedding the extra weight right now will be nice for my front suspension. So are those 6bolts the only thing I will need to take off before that bumper comes off?

 

https://www.carid.com/images/arb/off-road-bumpers/pdf/arb3423030-installation-instructions.pdf