the article says the futures are still trading high, meaning you probably couldn't make a lot of money buying them right now, likely because traders know the prices are going to come up too.
Selling the futures is the profitable end of the trade. Spot prices for WTI are about $20. That same oil can be sold in May 2021 for 35.53. Part of that difference is cost of carry (storing and insurance), but there is still a profit to be made.
