Excluding category from post navigation in WordPress?

Check the signature of the function:

next_post_link( string $format="%link »", string $link = '%title', bool $in_same_term = false, array|string $excluded_terms="", string $taxonomy = 'category' );

Excluded terms should be the fourth argument.
Your code is passing a “true-ish” argument to $in_same_term.

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