It's worth keeping in mind that this was the same site promoting unlikely rumors suggesting that Ryzen 3000 processors would be launching in January of last year for unbelievably low prices substantially below what the 2000-series was selling for, with boost clocks reaching 5 GHz on some models. In reality, they didn't come until half a year later, the clock rates were totally different, and the prices were around $100 higher for any given core count. And some things, like an 8-core, 16-thread Zen 2 processor with integrated Navi 20 GPU didn't even happen, let alone for $225.
Much of those rumors were really difficult to believe, and defied logic in many ways, but they kept pushing them anyway, and even other sites like Tom's hardware got in on reporting about them. So them "expecting" Rocket Lake this year doesn't actually mean much. That's not to say that they don't often report on rumors that turn out to be accurate, but a number of them don't actually pan out, and you have to use some discretion in determining what to believe. Maybe there will be some Rocket Lake CPUs launching near the end of the year, but I find it a bit unlikely that Intel intends on replacing their Comet Lake desktop lineup with them. Perhaps it will be like Comet Lake, where the first low-power mobile processors launched last fall, but desktop processors didn't get announced until half a year later.