Too bad the attached document is a Ruckus-branded document, is the full Carnet document available somewhere?
I'm wondering if they have been using IAP-225's or AP-225's with a controller. If no Aruba-engineer was present to configure the setup, that would suggest a rather default config and maybe an out-of-the-box firmware.
Old firmware doesn't benefit Aruba, especially with the AP-225's where there have been a number of issues with the drivers on the AP-side.
A default config could for example mean no broadcast-filtering, which can degrade the performance fast with lots of clients. A Cisco controller with default config has broadcast-filtering enabled with default. Ruckus has optimization enabled for delivery of broadcast/multicast frames by default.