Are remote employees considered off-site employees for the NSF Safe & Inclusive Working Environment Plan requirement?

It depends on whether the remote employee falls into this NSF definition: “Off-campus or off-site research is defined as data/information/samples being collected off-campus or off-site, such as fieldwork and research activities on vessels and aircraft.”
Those working from home would not fall under this definition.

Instructions and links via the UW Fillable form: Safe & Inclusive Working Environment for Off-site Research