It sounds like you are using a PiAware SD card image installation. You need to build a custom Pi. Install the Raspbian OS and then install the PiAware packages. This is described as a “package install” on our web site.
Piaware does have some configurations for static IP but this isn’t for changing the wifi into a hotspot (aka access point).
You can turn off managed configuration with the following command line option
“piaware-config manage-config no”
You can show all the current configurations to make sure everything is setup correctly. Without manage configuration on the piaware and dump1090 settings are not updated on reboot.
“piaware-config -showall”
Follow the instruction you posted to change your wifi into an AP.
I should mention it is much easier to have the PiAware connect to a wifi and then have your IPAD connect to the same wifi. Both the devices can see each other since they are on the same local network.