Harman International is owned by Samsung. It markets its products under various brands. These include Arcam, Harman Kardon, Mark Levinson, Lexicon, Revel, Infinity and JBL.
I could foresee them selling audio integrated amps with Roon-specific proprietary streaming software, or Roon enabled active/wireless speakers. They also market car audio systems. It's possible in any of these configurations they and could offer Roon that would bypass the need to use IOS/Android devices.