Sure but for what? It could be the R6 is actually ready to go, but they wanted to announce the development of the higher end model to protect sales. R6 announcement + preorder at CP+, R5 preorder a month later, ships 2 months after that.
It's also a pretty controlled release of info. Dev announcement with a few stunning features (speed, ibis, 8K) to get the hype machine going. Could explain CR guy's note about canon being annoyed—they a) wanted to control the info and b) don't want people splitting hairs about 4K modes (which will have limits)—they want people saying SONY IS DOOMED IF THEY DON'T HAVE 8K.
Alternately, they know the A7SIII is on the way and want to spoil Sony's fun. A "video focused A7S3" that only does 4K or 6K will seem wimpy right out of the gate, even if it has internal raw modes. 8>>>6!