This does quite add-up. RDNA5 which will be RX 9000 series is due to launch late 2025 or early 2026. The article must be implying late 2026 if they are also saying it could be 2027. There's not a snowball's chance in hell RX9000 will launch that late, with Nvidia basically having Rubin ready to go by late 2026, so RX9000 will be competing against 2 generations newer gpu's than now. RX9000 needs to be out well before Rubin.
A Chiphell leaker says AMD's new unified UDNA architecture will debut sometime in 2026-27 with the Radeon RX 9000 series. Additionally, it will also power the PlayStation 6, along with a Zen 4/Zen 5 CPU.