Why didn't India get WTC points despite historic innings and 300-run win over Afghanistan in Mullanpur?

India steamrolled Afghanistan in the one-off Test at the Maharaja Yadavindra Singh International Cricket Stadium, Mullanpur, with a historic innings and 300-run win as their spinners starred to bowl Afghanistan out for just 112 in the follow-on. Washington Sundar and Kuldeep Yadav combined for seven wickets in the second innings as the first innings star Manav Suthar and Mohammed Siraj picked up a wicket each before Sharafuddin Ashraf didn't turn out to bat due to injury as India registered their biggest innings win.