No. It just said that cutting them up doesn’t kill them. There was no mention of tossing them in a fire, but I’ll bet that would work.
When I found out what they were all about, the next time I found one, I poked a fire ant mound and then dropped the flatworm into the ants that made pretty short work of it, so I've discovered the one redeeming feature of fire ants. Normally I just toss them into a little can of rock salt (with a lid) I keep handy in my shed just for them.