GPS jamming from Kaliningrad has been around for a while but became more intense since the 2022 invasion of Ukraine. Either whoever was operating the flight wasn't well prepared (it was a charter) or the story is being used to further another purpose?
FlightRadar24 on Xitter reports: This is what we can deduce from our data. * The flight was scheduled to take 1 hour and 48 minutes. It took 1 hour and 57 minutes. * The aircraft's transponder reported good GPS signal quality from take-off to landing.