While it doesn't talk about MST regions it's clear from the config they don't set MSTP config-name or version and the default values for Aruba CX means each switch will end up as its own MST region. Looking at the output of the commands shown on the access layer CX switch you can see the 'regional root address' is the local access switch while the bridge address and designated root address is the aggregation/core. So whoever wrote this guide didn't design it so that you had a common MST region for all access switches and that each access layer switch would be it's own MST region. Either that or it's an oversight.
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