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Well, the Daily Wire has a popup inviting you to subscribe, to join the "voice of sanity" in its fight against the "radical leftist agenda", so I'm not convinced it's an unbiased source.
But even taking its report at face value (because I can't be arsed looking for another source), the guy was jailed for contempt of court, for breaching the court order to not misgender his child, not directly for the misgendering.
The word 'after' in the URL is important (and the word 'daughter' clarifies the site's agenda) ...
ETA - there's a fairly coherent report from the New York Post, which I'd say puts him somewhere on the same scale as Enoch Burke.
https://nypost.com/2021/03/18/man-arrested-for-discussing-childs-gender-in-court-order-violation/
I can try to factcheck for you, but I'm not sure people linking gender neutral pronouns to lack of freedom of speech are open to facts and I can't find anything in Dutch either...
Sounds similar to Jordan Peterson claiming someone in Canada went to jail for misgendering someone but that didn't actually happen so... š¤