Where did you read that? The closest I could find was "Does the new model demand that I have Internet access?" [1] in which it states that it requires an internet connection every 30 days to authenticate and if it cannot then it will close the application. I'm guessing that also means if it does auth but sees an expired license, it would also close the application.

[1] https://sales.jetbrains.com/hc/en-gb/articles/204344871-Does...