@zorglups there's a bug in the V1 proxy script, remote.pl, and this prevents files to be loaded properly if the file (URL) does not have a proper extention.
a fix has been made, and the V2 website is running the fixed version of remote.pl
but you need to provide a URL which accesses a V2 design, such as...
https://www.jscad.xyz?uri=https://www.thingiverse.com/download:8705160
OR
https://www.jscad.xyz#https://www.thingiverse.com/download:8705160