No, they are not. They are part of "The Greens/European Free Alliance" political group in the parliament alongside the European Green Party and some other smaller green and regionalistic parties.
Edit: however, the quote from the article speaks about the parliamentary group not the party, therefore this would imply that Volt is on board with this statement or Damian von Boeselager is, who is the only Volt MEP to date.
Most science can't be done on a basic income, you need funds to buy equipment, to operate equipment, and maintain equipment. Most science also can't be done alone. You have to be able to sell others on your ideas, in any economical system that is not post-scarcity.