Here's an example. The image heights for these 'RF-S' lenses are in the 18-20mm range, they're clearly for FF with intended distortion correction (with more of it needed the wider the AoV). The 'RF-S 24/1.8' lens mentioned in the post is actually the real RF 24/1.8 STM lens that launched a month before the blog post.
A new patent showing off some lens element coating to help with ghosting and other anomalies has appeared alongside optical formulas for what appears to be RF-S
www.canonrumors.com
Here's another, in this case the one 'RF-S' lenses exemplified in the patent is actually the real RF 16/2.8 STM lens that had already been on the market for several months.
It looks like Canon will be bringing one or more RF-S prime lenses for the Canon EOS R7 and Canon EOS R10. One of the most requested RF-S lenses is unsurprising
www.canonrumors.com
Just to frustrate you, they're not just doing it for FF lenses. For example, the recent patent for an RF-S 15-70/4:
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