Don't go looking for a tidy story here, because the poem seems built to dodge one. Its title, "Not This," works like a warning: whatever you expect, it isn't that. The lines pile up odd images, such as a pirate's thumb, ginger hiding inside ego, and ginseng buzzards, and they connect through sound and sideways association rather than sense. "Gulf" slides toward "golf," and by the end the pirates are playing it behind a humble garage, which is a funny, deflating place to land.
The speaker's feelings are hard to pin down, but the tone feels playful and a little mocking. The repeated "hidden in the ego" and "idea of the ego" suggest a joke at the expense of self-importance, with big abstract ideas buried under silly imagery. The mood is light, absurd, and slippery. The poem seems to invite you to enjoy the sounds and surprises instead of decoding them, and the ordinary garage at the end makes the strangeness feel oddly cozy.