What is real? You have not defined terms.
Existence is a concept. Nonexistence is a concept, a contradictory concept. They serve as conceptual mechanisms for conscious beings.
Existence is a concept, a term. Concepts and terms indicate things, they mean things. The term “apple” indicates the fruit, for example. This is commonly accepted and understood. Likewise the term existence indicates all things, not only concepts.
The term existence indicates all things, each and every thing including the term itself and the entirety of things as expressed in the essay. The term, the word, the concept itself as a thing is limited. That which the term indicates or represents is unlimited.
Nonexistence is also a concept, a term. A contradictory concept or term. Nonexistence is not some ambiguous, mysterious remoteness revealed through the term or concept. Rather nonexistence is an abstraction, an abstraction constructed in the mind for purposes of conceptual processing and projected outward through language.
Language is used as a tool to convey ideas. Language has limits. Language only goes so far and can only do so much.
Reality is an exclusive concept, not a comprehensive one. Reality is confined to reality at the exclusion of fantasy.
Existence is infinite. Existence includes both reality and fantasy.
Reality is limited by fantasy as sea is limited by land. Where reality is limited to the shore existence is the shore, and the tide, and the ocean, and the sand and all else.
However as expressed in the essay existence simply is. All variation, all opposition balances as simply being, as simply existence. This reflects the sentiment you share without confining it to Buddhist thought.