I don't think they're arguing that no one should try to replicate the process of making it, just that it makes sense to have another lab test the sample that has already been created. If it is in fact what they claim it is, then the worst case scenario is that we have a repeat of FOGBANK[0] and have to reverse engineer it.
I'm not arguing that another lab shouldn't test the sample already created, just stating why replication is important. A FOGBANK situation is a very bad scenario.
[0] https://en.m.wikipedia.org/wiki/Fogbank