This is extremely misleading. The pro-status quo party boycotted the referendum. I'm relatively ignorant of the political situation in PR but it's obvious that this isn't a situation with near-universal consensus.

The pro-status-quo groups have been actively avoiding honest participation from the 1998 vote on, because they'd rather a vote with unclear results than a clear loss (though even so, they clearly lost in 2012, though their non-participation in the “if not status quo, then what” part of that ballot was used as grounds to deny the import of the substantial win by Statehood on that ballot.)