How remove link from customer menu when customer in general group?

How do I remove a link from customer menu when customer group is general?

I know about the ifconfig tag, but it does not give me the possibility to hide a custom link when a customer in the general group.

I use Magento 2.2.4.

class Current extends \Magento\Framework\View\Element\Html\Link\Current //block
{
    /**
     * @return string
     */
    public function toHtml()
    {
        if (SOME CONDITION HERE) {
            return parent::toHtml(); //show link
        }

    return ''; //hide link
}

//Layout

<referenceBlock name="customer_account_navigation">
        <block class="...\Current" name="customer-account-navigation-product">
            <arguments>
                <argument name="path" xsi:type="string">.../index</argument>
                <argument name="label" xsi:type="string">Product</argument>
            </arguments>
        </block>
    </referenceBlock>