“There has been a very large double fence (with vehicle road and lights) in that exact sector for years”
That’s where Border patrol said they needed it. I think they want bollards because they are tied of whack-a-mole, with frequent cutting of breaches, and having to find and repair them.
Trump is targeting the highest traffic areas first - basically the urbanized areas of the border. Cochise County would not get their barrier for several years, at the Congressionally envisioned rate of $1.6 per year (~100 miles urban, 150 rural). If a big enough lump of funding comes through in the next budget (October, if no continuing resolutions), Cochise County could get contracts awarded next year, with about 1-2 years to build.
I'm not sure BP wants actual bollards since the definition says short posts used for protecting buildings and such. You see them all the time now. I think BP has been very happy with the double fencing in San Diego. I'll check to see what their current thinking is, but it's not bollards unless they have their own definition.