According to Qlik and as announced by their Community Manager Jamie Gregory, they confirmed the following:
"We will continue to support these products until the retirement date, January 31, 2022. You can continue to renew your support agreements, through the retirement date. However, renewal support agreements will not go beyond January 31, 2022, even if this is shorter than your normal support renewal period. Existing support agreements that expire after the retirement date will be honored; these agreements are not eligible for renewal.  Support for any additionally purchased licenses will not extend past January 31, 2022."