Then they say that they aren't sure if their model accessed the other researchers' private data. Why not wait until they know for sure, rerun in a way they can

Then they say that they aren't sure if their model accessed the other researchers' private data. Why not wait until they know for sure, rerun in a way they can ensure doesn't access the other researchers' private data, or wait until the other researchers have published to make sure they're not stealing another person's work to build upon?