It's quite likely that RS's admins, when they see the broken links feedback people submit, will directly test the final netdisk link rather than clicking the button themselves and waiting for the countdown…
So when I filled out that feedback, I wrote just a few short words in the name field to describe the problem, something like: "Button turns grey after the countdown Help"
But it's been two days now and the problem still persists, so I don't know whether they even look at the content of these feedback reports.