In general, we would say "Only this way can we", but I also came across many sentences in the internet which use “Only this way we can”. Is the expression "Only this way we can" grammatically correct and natural? Many thanks!
"To find the best way of living a worthy life through a relatively uncharted experience, is simply by using our intuition. Only this way we can learn the wonders of eternal consciousness, and literately witness that it is alive and exists at all."(The Conspiracy Rhetoric of Mankind author: Paul J. Linke)
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The above is the same question as in https://forum.wordreference.com/threads/only-this-way-we-can-can-we.3564026/ ; however, the answers there seem not to be theoretical or persuasive to explain why this grammar is necessary, so I copy and paste it here.