I heard about that one, too, and saw a video about it. The scammer tells the victim that the IRS has their assets temporarily frozen. That's how they convince the victim that these cards are the only means of payment and to prevent them being arrested. In fact, they tell the victim that enforcement officers will arrive at their address in 45 minutes, that's the reason for their call, to warn them (the victim).
How many college students know how the IRS works, and what powers they actually have? I know the IRS doesn't have the power to send law enforcement to my door, or to freeze my assets at a moment's notice. I know a case has to be opened before the IRS can do anything to me, and that such a case can take months and is preceded by lots of letters letting me know there is a case and what it's about.
But I'll cut that college student some slack because how many 20-somethings know all that? I only know because I looked into it, mostly online, and not until I was in my 40s. Sadly, Miss Diva, this stuff isn't taught in schools, and it's not normal dinner conversation either, not in most households.