Jack I have to say that this is quite normal on MEDLANDS, which is why I have a habit on wikitree of pointing out that we should not be naive about the quality control there.
One of the aims he has given himself is to use only primary sources and not be influenced by secondary sources. But the reality is that he has clearly used secondary sources, but old ones, and inconsistently. He does not always mention this. Therefore MEDLANDS is filled with comments such as "the primary source has not yet been found" which are a little odd.
Sometimes this is quite definitely misleading and simply apparently because he could not follow through himself. I have for example written to him about cases where he says an author says X but does not name their source, but where the source is absolutely clearly stated in the same sentence so to speak.
In other words, whenever you see that something is unknown or has not been traced. You unfortunately need to read this, at least most times, as simply meaning HE has to work on this later to finish it off.
MEDLANDS can be useful in my opinion but it can be a challenge also.