Yep! When you plug it in to your machine through a USB-C cable, it attaches as an ethernet device and answers to `ssh root@10.11.99.1`. You can also activate an http UI that you can then use to upload files with `curl --form "file=@\"$1\"" "http://10.11.99.1/upload"`.
If you're curious about the file format, have a look at https://remarkablewiki.com/tech/filesystem#user_data_directo...