They've either since revised (unlikely), or they didn't:
The England international has ended the uncertainty going into the new season by committing himself to a long-term deal
www.telegraph.co.uk
Aston Villa’s midfielder Jack Grealish has signed a new five-year contract, the club have announced
www.theguardian.com
The Telegraphs reporter is John Percy, who is as reliable as it gets for the midlands clubs, and he's never reported on a buy out clause.
If a player as good as Grealish has a £65m buy out clause like some on here are suggesting, it would be absolutely massive news as pretty much every top English club would be in for him at that price.