@Cmeer Please use below code instead of the code you shared to display something only for “Netherlands” customers. Kindly let me know whether it works.
{% if localization.country.name == 'Netherlands' %}
SOMETHING TO SHOW
{% endif %}
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@Cmeer It might be because if visitors from Belgium select the Netherlands through the localization option or country selector popup while visiting your website. On that time, the content added for the Netherlands will be displayed, even when the user is located in the Belgium.
If you didn’t provide localization select option, but the content is still displaying, please share your store URL to check your store further.