Well, as he said, the Itzulia crash hampered him. He had difficulty at high speed and with melted snow water on the road in the curves it was murder.
let's count the reasons Remco might be a little nervous/cautious going down a mountain:
1. He almost died riding his first monument at age 20 -- that could also have been a career-ending injury (and as it is probably hurt his progress for over a year).
2. He almost lost the Vuelta in 2022 because of a crash (that is pretty clear now that his dropping of a few seconds 2 and 3 days after that crash was a residual of the crash).
3. He was part of a horrific crash at the Basque Tour that almost jeopardized his entire season's goal.
4. He just crashed on watery roads in the Dauphine
and...
5. He rode past a few seconds after Gino Maher went off the road at TDS last year.
Not sure he will ever develop into a good descender, but there are plenty of totally logical reasons why he may have gone cautiously today.