Yes, a search for 'GPS jamming Baltic' turns up hits from everything from DW to the Financial Times.
It's a problem for maritime and aviation navigation, and a problem for both sides in the war in Ukraine. Some drones are now using fiber optic tethers to get around the jamming, that's not much of an option for civilian traffic though.
It's not a Signal problem, this is just bad journalism.
Signal also did an update one month ago to help mitigate phishing https://www.wired.com/story/russia-signal-qr-code-phishing-attack/
To be clear though, phishing was Not the problem in this case. Incompetence was the problem.