Not read this article - must have missed it.
Split liability decision?
Sounds like an insurance claim to me whereby the insured have disputed stories. Surprised no police involvement if SI though - as one or the other or both would be prosecuted for a careless/undue dependent on the accident investigation.
As for the ruling and "if he'd been going slower"

Canot speculate really as do not know :
1. Width of each carriageway and was the Clio over the line because driver was allowing space to a pedal cyclist or other hazard?
2. Was it a "sudden" swerve over the line on the part of the Clio? No idea from the post - but apparently judges did not have any evidence to suggest this - given the decision.
3. Why was the biker positioned where he was? Had he space to move in or had he overtaken something and not moved far enough into the lane?
4. If he'd overtaken something - perhaps he had somehow missed the positioning manoeuvre of the approaching Clio which caused it to straddle the white line by a metre?
Trouble is - only those judges, insured, insurance companies and perhaps police if involved know the true set of circumstances.
But one thing sticks out to me
Neither of these were using
C.O.A.S.T

And as such both are to blame.
ie.
Clio driver should have been looking ahead and noted the position of the biker and biker should have been looking ahead and noting the position of the Clio.
As for the
speed - neither were speeding as I read the post - and thus human error by both involved.
Sure as heck emphasises that
sole focus on speed is not a correct approach - and a fully comprehensive look at improving basic skills is of much more value long term!