Sorry for doubting that you knew everything about everything.
I don't know where JKderry gets their information from but it's consistently wrong. The thread about the election being at Elstree is a prime example where they present information as fact but then backtrack when it's proven to be incorrect. This isn't the only example sadly.
There's nothing wrong with enquiring and showing an interest in studio locations and I'd love to be able to reply fully to these topics but with commercially sensitive information I and others in the industry tread carefully. For that reason many posts on here would and should be presented as pure speculation. To dress it up as anything else does this forum and the poster a disservice.
Anyway back on topic: Riverside may gain more interest once the first show has successfully been made and completed there - productions are rightly risk-averse and wouldn't want to be the first from any new facility. They will begin to gain traction once things are proven to work.
I work in telly, I sometimes get time to watch telly. More of a technology geek than a presentation geek!