Absolutenaly. If we have no one U106+ how can we have any U198+? I guess It's pretty much obvious that they by mistake typed U198 in wrong field since U198 even not under P312 it's from parallel branch. They should put it in one field upper with U106.
That's why I wrote in my original post that the authors of the study mistook and listed U198 with P312 instead of U106. We still don't know if the samples are U106/U198 or P312.