Are the questions of the type «Does anyone have access to this paper?» valid at CV?
It is off-topic because it isn't about statistics, machine learning, etc; but having access to a given reference. It would also be kind of a private question which is of low interest to the community.
Glen_b provides more advice within a comment:
I'd regard it as off-topic; it's not a question on statistics / machine learning but on access to papers. If you were to ask on chat that might be okay (e.g. if you wanted to know if someone could check some detail in a paper for you; asking to be supplied with a paper you didn't have legitimate access to would not be okay there either).