^I think you're putting a little too much thought into an offhand comment by a random mechanic.
Then again, he might have had access to some sort of long term plan that basically said "We'll put a big-ish coaster here some day" regarding the Gwazi site. The management might have decided to reserve the land for a "speedy coaster", even though nothing has been settles in regards to manufacturer, layout or perhaps even year of construction.