This is fairly accurate.
Existence is simply too vast to represent or depict in any proper way. There is no single image, no banner or flag which could do existence justice.
Generally speaking existence has no definitive form or shape to depict. There is no way to transcend existence, to travel beyond existence to capture any image or discern any form of existence as a state, country or province.
Existence is too big to fly. Existence is all things, existence is all locations therefore existence could not fly or travel to another location because existence would be that location too.
The essay is figuratively titled as such to convey the evidently unreachable goal of global unity. The idea is too big to fly because it’s seemingly too ambitious to succeed. In many cases neighbors fail at getting along. If neighbors next door can’t peacefully coexist how could countries or planets?