The last paragraph feels like Okrand going along with the joke, rather than rejecting {qurbuSwI'} outright, so {qurbuSwI'} is sort-of taken as canonical Morskan by some people.
The unaspirated {p} might not be an intentional aspect of the dialect. Native English speakers often don't aspirate P in non-initial positions, and aspiration is not a feature in English phonology, so it's possible the speaker simply pronounced it like a regular English p.